Tuxcare Errata System 0.0.1 5.10 2026-06-10T14:45:21 Ubuntu 20.04 LTS * SECURITY UPDATE: Denial of service via a ZIP bomb - debian/patches/CVE-2019-9674.patch: add pitfalls to zipfile module documentation - CVE-2019-9674 Important TuxCare License Agreement CVE-2019-9674 Ubuntu 20.04 LTS * SECURITY UPDATE: DOS, buffer overflow in SHA3, Possible Bypass Blocklisting Redirection vulnerability in http.server, regex DOS, Quadratic complexity, pathname quoting for venv - debian/patches/CVE-2022-37454.patch: fix a buffer overflow in Modules/_sha3/kcp/KeccakSponge.inc, Lib/test/test_hashlib.py (LP: #1995197). - debian/patches/CVE-2022-45061.patch: fix quadratic time idna decoding in Lib/encodings/idna.py, Lib/test/test_codecs.py. - debian/patches/CVE-2023-24329.patch: enforce that a scheme must begin with an alphabetical ASCII character in Lib/urllib/parse.py, Lib/test/test_urlparse.py. start stripping C0 control and space chars in `urlsplit` - debian/patches/CVE-2021-28861.patch: Fix an open redirection vulnerability in the `http.server` module when an URI path starts with `//` - debian/patches/CVE-2024-6232.patch: Fix header parsing vulnerability that could lead to ReDoS - debian/patches/CVE-2024-7592.patch: fix quadratic complexity in parsing "-quoted cookie values with backslashes - debian/patches/CVE-2024-9287.patch: Quote template strings in `venv` activation - CVE-2022-37454 - CVE-2022-45061 - CVE-2023-24329 - CVE-2021-28861 - CVE-2024-6232 - CVE-2024-7592 - CVE-2024-9287 Important TuxCare License Agreement CVE-2019-17514 Ubuntu 20.04 LTS * SECURITY UPDATE: zip bomb vulnerability in Lib/zipfile.py - debian/patches/CVE-2019-9674.patch: add pitfalls to zipfile module documentation - CVE-2019-9674 * SECURITY UPDATE: Infinite loop - debian/patches/CVE-2019-20907.patch: avoid infinite loop in the tarfile module in Lib/tarfile.py, Lib/test/test_tarfile.py. - CVE-2019-20907 Important TuxCare License Agreement CVE-2019-9674 Ubuntu 20.04 LTS * SECURITY UPDATE: DoS in case of malicious XML entity declarations - debian/patches/CVE-2022-48565.patch: reject XML entity declarations in plist files - CVE-2022-48565 * SECURITY UPDATE: Bypassing blocklisting methods by supplying a URL that starts with blank characters - debian/patches/CVE-2023-24329.patch, debian/patches/CVE-2023-24329-2.patch: prevent urllib.parse.urlparse from accepting schemes that don't begin with an alphabetical ASCII character - CVE-2023-24329 * SECURITY UPDATE: ReDoS via specifically-crafted tar archives - debian/patches/CVE-2024-6232.patch: remove backtracking when parsing tarfile - CVE-2024-6232 * SECURITY UPDATE: Excessive CPU usage while parsing a cookie value - debian/patches/CVE-2024-7592.patch: fix quadratic complexity in parsing double-quoted cookie values with backslashes - CVE-2024-7592 * SECURITY UPDATE: CPU DoS by crafting inputs to the IDNA decoder - debian/patches/CVE-2022-45061.patch: fix quadratic time idna decoding - CVE-2022-45061 * SECURITY UPDATE: Use-after-free via heappushpop in heapq - debian/patches/CVE-2022-48560.patch: fix posible crash in heapq with custom comparison operators - debian/patches/CVE-2022-48560-2.patch: add tests for CVE-2022-48560 - CVE-2022-48560 * SECURITY UPDATE: DoS by HTTP client infinite line reading from malicious server after a 100 Continue response - debian/patches/CVE-2021-3737.patch: stop reading a header if it's too long - CVE-2021-3737 * SECURITY UPDATE: A flaw in the urllib.parse module - debian/patches/CVE-2022-0391.patch: make urlparse sanitize URLs containing ASCII newline and tabs - CVE-2022-0391 Critical TuxCare License Agreement CVE-2019-20907 CVE-2021-3737 CVE-2024-7592 CVE-2024-6232 CVE-2023-24329 CVE-2022-45061 CVE-2022-48565 CVE-2022-48560 Ubuntu 20.04 LTS * SECURITY UPDATE: Overwriting of arbitrary files by remote attackers - debian/patches/CVE-2007-4559.patch: implement PEP 706 - a filter in the tarfile module to prevent directory traversal vulnerability - CVE-2007-4559 * SECURITY UPDATE: Bypass of domain e-mail-based protection mechanism by incorrect parsing of e-mail addresses that contain a special character - debian/patches/CVE-2023-27043.patch: reject malformed addresses in email.parseaddr() - CVE-2023-27043 * SECURITY UPDATE: Bypass of the TLS handshake and included protections - debian/patches/CVE-2023-40217.patch: check for & avoid the ssl pre-close flaw - CVE-2023-40217 Moderate TuxCare License Agreement CVE-2007-4559 CVE-2023-27043 CVE-2023-40217 Ubuntu 20.04 LTS * SECURITY UPDATE: DoS in regular expression because of urllib.request.AbstractBasicAuthHandler catastrophic backtracking - debian/patches/CVE-2020-8492.patch: fix DoS in the urllib regexp - CVE-2020-8492 * SECURITY UPDATE: a header injection vulnerability for http methods in the httplib - debian/patches/CVE-2020-26116.patch: prevent header injection in http methods in httplib - CVE-2020-26116 Important TuxCare License Agreement CVE-2020-26116 CVE-2020-8492 Ubuntu 20.04 LTS * SECURITY UPDATE: Web cache poisoning vulnerability - debian/patches/CVE-2021-23336.patch: fix web cache poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs - CVE-2021-23336 * SECURITY UPDATE: Regular expression denial of service - debian/patches/CVE-2021-3733.patch: fix flaw in urllib’s AbstractBasicAuthHandler that could lead to a denial of service by leveraging a regular expression - CVE-2021-3733 * SECURITY UPDATE: Constant-time-defeating optimisations issue - debian/patches/CVE-2022-48566.patch: make compare_digest more constant-time - CVE-2022-48566 * SECURITY UPDATE: Incorrect parsing of email addresses containing special characters - debian/patches/CVE-2023-27043.patch: Fix email address parsing errors by adding optional 'strict' parameter to getaddresses() and parseaddr() functions - CVE-2023-27043 * SECURITY UPDATE: TLS handshake bypass - debian/patches/CVE-2023-40217.patch: Check for & avoid the ssl pre-close flaw. Update SSL tests - CVE-2023-40217 Moderate TuxCare License Agreement CVE-2023-40217 CVE-2021-23336 CVE-2023-27043 CVE-2021-3733 CVE-2022-48566 Ubuntu 20.04 LTS * SECURITY UPDATE: Traversing outside chmod directory - debian/patches/CVE-2024-12718-CVE-2025-4138-CVE-2025-4330-CVE -2025-4435-CVE-2025-4517.patch: re-filters directory members before chmod/chown - CVE-2024-12718 * SECURITY UPDATE: Symlink exfiltration - debian/patches/CVE-2024-12718-CVE-2025-4138-CVE-2025-4330-CVE -2025-4435-CVE-2025-4517.patch: properly handles different link semantics - CVE-2025-4138 * SECURITY UPDATE: Hardlink Fallback Attack - debian/patches/CVE-2024-12718-CVE-2025-4138-CVE-2025-4330-CVE -2025-4435-CVE-2025-4517.patch: re-filter the source if hardlink extraction falls back to copying - CVE-2025-4330 * SECURITY UPDATE: Errorlevel=0 Extracts Rejected Members - debian/patches/CVE-2024-12718-CVE-2025-4138-CVE-2025-4330-CVE -2025-4435-CVE-2025-4517.patch: account errorlevel - CVE-2025-4435 * SECURITY UPDATE: PATH_MAX Attack - debian/patches/CVE-2024-12718-CVE-2025-4138-CVE-2025-4330-CVE -2025-4435-CVE-2025-4517.patch: prevents PATH_MAX overflow attacks - CVE-2025-4517 * TEST UPDATE: Incorrect encoding leading to an unexpected exception in test_tarfile.py - debian/patch/fix_test_tarfile-enconding.patch: fix encoding Important TuxCare License Agreement CVE-2025-4330 CVE-2025-4138 CVE-2025-4517 CVE-2025-4435 CVE-2024-12718 Ubuntu 20.04 LTS * SECURITY UPDATE: Ability to modify permissions with privileged programs - debian/patches/CVE-2023-6597: prevent tempfile.TemporaryDirectory class dereference symlinks - CVE-2023-6597 Important TuxCare License Agreement CVE-2023-6597 Ubuntu 20.04 LTS * SECURITY UPDATE: Memory denial of service in plistlib - debian/patches/CVE-2025-13837.patch: read large data by chunks, therefore the upper limit of consumed memory is proportional to the size of the input file. - CVE-2025-13837 Moderate TuxCare License Agreement CVE-2025-13837 Ubuntu 20.04 LTS * SECURITY UPDATE: Shell command injection in mailcap module - debian/patches/CVE-2015-20107.patch: sanitize the second argument which allowing shell commands injection - CVE-2015-20107 Important TuxCare License Agreement CVE-2015-20107 Ubuntu 20.04 LTS * SECURITY UPDATE: Shell command injection in the mailcap module - debian/patches/CVE-2015-20107.patch: sanitize the second argument which allowing shell command injection - CVE-2015-20107 Important TuxCare License Agreement CVE-2015-20107 Ubuntu 20.04 LTS * SECURITY UPDATE: Quadratic complexity in xml.minidom node ID cache clearing - debian/patches/CVE-2025-12084.patch: remove quadratic behavior in xml.minidom node ID cache clearing - CVE-2025-12084 Moderate TuxCare License Agreement CVE-2025-12084 Ubuntu 20.04 LTS * SECURITY UPDATE: Quadratic complexity in os.path.expandvars() - debian/patches/CVE-2025-6075.patch: fix quadratic complexity in os.path.expandvars() by replacing the character-by-character loop with regex-based substitution in both posixpath and ntpath modules. - CVE-2025-6075 Moderate TuxCare License Agreement CVE-2025-6075 Ubuntu 20.04 LTS * SECURITY UPDATE: defect in 'tarfile' module leads to infinite loop and deadlock in parsing of maliciously crafted tar archives - debian/patches/CVE-2025-8194.patch: Validate archives to ensure member offsets are non-negative - CVE-2025-8194 Important TuxCare License Agreement CVE-2025-8194 Ubuntu 20.04 LTS * SECURITY UPDATE: defect in 'tarfile' module leads to infinite loop and deadlock in parsing of maliciously crafted tar archives - debian/patches/CVE-2025-8194.patch: Validate archives to ensure member offsets are non-negative - CVE-2025-8194 Important TuxCare License Agreement CVE-2025-8194 Ubuntu 20.04 LTS * SECURITY UPDATE: quadratic complexity in os.path.expandvars() - debian/patches/CVE-2025-6075.patch: replace character-by-character loop with regex-based substitution to fix quadratic complexity - CVE-2025-6075 Moderate TuxCare License Agreement CVE-2025-6075 Ubuntu 20.04 LTS * SECURITY UPDATE: command-line option injection in webbrowser.open() - debian/patches/CVE-2026-4519.patch: reject leading dashes in webbrowser.open() URLs to prevent command-line option injection in browser subprocesses - CVE-2026-4519 Low TuxCare License Agreement CVE-2026-4519 Ubuntu 20.04 LTS * SECURITY UPDATE: command-line option injection in webbrowser.open() - debian/patches/CVE-2026-4519.patch: reject leading dashes in webbrowser.open() URLs to prevent command-line option injection in browser subprocesses - CVE-2026-4519 Low TuxCare License Agreement CVE-2026-4519 Ubuntu 20.04 LTS * SECURITY UPDATE: zipfile quoted-overlap zip bomb - debian/patches/CVE-2024-0450.patch: raise BadZipFile when an archive entry overlaps with another entry or the central directory, preventing quoted-overlap zip bombs with extreme compression ratios. - CVE-2024-0450 * SECURITY UPDATE: use-after-free in lzma/bz2 decompressors - debian/patches/CVE-2026-6100.patch: null next_in at the error: label of decompress() in Modules/_bz2module.c and Modules/_lzmamodule.c so the decompressor cannot be re-used with a stale buffer pointer after a MemoryError. - CVE-2026-6100 Critical TuxCare License Agreement CVE-2026-6100 CVE-2024-0450 Ubuntu 20.04 LTS * SECURITY UPDATE: use-after-free in BZ2Decompressor when MemoryError is raised in the C-level decompress() helper - debian/patches/CVE-2026-6100.patch: defensively null bzs->next_in on the error: path of BZ2Decomp_decompress in Modules/bz2module.c. - CVE-2026-6100 Critical TuxCare License Agreement CVE-2026-6100 CVE-2020-27619 CVE-2024-0450 CVE-2021-3177 CVE-2021-4189 Ubuntu 20.04 LTS * SECURITY UPDATE: email BytesGenerator header injection - debian/patches/CVE-2026-1299.patch: verify generated headers in email.generator.BytesGenerator and Generator. Adds the HeaderWriteError exception, NEWLINE_WITHOUT_FWSP / NEWLINE_WITHOUT_FWSP_BYTES regexes, and the Policy.verify_generated_headers attribute, then raises HeaderWriteError when the folded header does not end with the policy linesep or contains a stray newline. Includes the CVE-2024-6923 prerequisite hardening of the string Generator. - CVE-2026-1299 * SECURITY UPDATE: ssl.SSLContext memory race in cert_store_stats / get_ca_certs - debian/patches/CVE-2024-0397.patch: backport the upstream X509_STORE_get1_objects shim and the x509_object_dup helper from cpython 29c97287d205bf2f410f4895ebce3f43b5160524, then switch _ssl__SSLContext_cert_store_stats_impl and _ssl__SSLContext_get_ca_certs_impl to take a deep-copy snapshot of the X509_STORE under lock, freeing the snapshot before returning. Closes a use-after-free triggered by loading certificates concurrently from another thread. - CVE-2024-0397 * SECURITY UPDATE: ipaddress is_private / is_global misclassification - debian/patches/CVE-2024-4032.patch: backport upstream gh-113171 / gh-65056. Update Lib/ipaddress.py to align the _private_networks lists with the IANA special-purpose registries and add _private_networks_exceptions so that is_private / is_global no longer misclassify addresses in 192.0.0.0/24 (with 192.0.0.9 and 192.0.0.10 exceptions), 64:ff9b:1::/48, 2002::/16, and the 2001::/23 sub-range exceptions (2001:1::1, 2001:1::2, 2001:3::/32, 2001:4:112::/48, 2001:20::/28, 2001:30::/28). Includes the matching docs and test updates. - CVE-2024-4032 Important TuxCare License Agreement CVE-2024-4032 CVE-2024-0397 CVE-2026-1299 Ubuntu 20.04 LTS * SECURITY UPDATE: header injection via newline in email.Generator - debian/patches/CVE-2026-1299.patch: add HeaderWriteError exception to Lib/email/errors.py, add NEWLINE_WITHOUT_FWSP regex to Lib/email/generator.py and check the header *value* in all four branches of Generator._write_headers(), raising HeaderWriteError when a CR/LF without folding whitespace is found. Updates test_embedded_header_via_string_rejected to expect HeaderWriteError instead of HeaderParseError. In Python 2.7 this single Generator-class hardening covers both upstream CVE-2026-1299 (BytesGenerator) and CVE-2024-6923 because BytesGenerator does not exist in 2.7. - CVE-2026-1299 * SECURITY UPDATE: missing header-name newline check in email.Generator - debian/patches/CVE-2024-6923.patch: add NEWLINE_WITHOUT_FWSP check on the header *name* at the top of Generator._write_headers() in Lib/email/generator.py, raising HeaderWriteError when a CR/LF without folding whitespace is found in the header name. Documents HeaderWriteError in Doc/library/email.errors.rst and adds a test_invalid_header_format regression test in Lib/email/test/test_email_renamed.py. - CVE-2024-6923 * SECURITY UPDATE: ssl.SSLContext data race in cert_store_stats / get_ca_certs - debian/patches/CVE-2024-0397.patch: backport of upstream 3.8 commit 29c97287d2 ("[3.8] gh-114572: Fix locking in cert_store_stats and get_ca_certs"). Adds a polyfill of OpenSSL 3.3's X509_STORE_get1_objects() (deep-copy under X509_STORE_lock()) and replaces the shared, unlocked X509_STORE_get0_objects() calls in cert_store_stats() and get_ca_certs() in Modules/_ssl.c, preventing a memory race and potential use-after-free when an SSLContext is shared across multiple threads. - CVE-2024-0397 * SECURITY UPDATE: open redirect in BaseHTTPServer when path starts with // - debian/patches/CVE-2021-28861.patch: backport of upstream commit 4abab6b603 ("gh-87389: Fix an open redirection vulnerability in http.server"). In Lib/BaseHTTPServer.py, after the request line is parsed, collapse any leading run of '/' characters to a single '/' so an attacker-controlled '//evil.example/...' path cannot become an absolute scheme-less URI in a 301 Location header. Adds a regression test in Lib/test/test_httpservers.py. - CVE-2021-28861 Important TuxCare License Agreement CVE-2024-6923 CVE-2021-28861 CVE-2024-0397 CVE-2026-1299 Ubuntu 20.04 LTS * SECURITY UPDATE: binascii.a2b_base64 / base64.b64decode stop decoding after the first padded quad, silently dropping any excess data. The behaviour can lead to data being accepted that other implementations process differently. - debian/patches/CVE-2026-3446.patch: backport of upstream commits 4561f6418a (main), e31c55121620 (3.14), 1f9958f909c1 (3.13). Treats the pad character as non-alphabet data per RFC 4648 section 3.3: the loop in binascii_a2b_base64_impl no longer breaks out on a pad sequence; a `pads` counter is added so post-loop validation still raises "Incorrect padding" for inputs that do not satisfy `quad_pos + pads == 4`. The unused `binascii_find_valid` helper is removed. - CVE-2026-3446 Moderate TuxCare License Agreement CVE-2026-3446 Ubuntu 20.04 LTS * SECURITY UPDATE: binascii.a2b_base64 / base64.b64decode stop decoding after the first padded quad, silently dropping any excess data. The behaviour can lead to data being accepted that other implementations process differently. - debian/patches/CVE-2026-3446.patch: backport of upstream commits 4561f6418a (main), e31c55121620 (3.14), 1f9958f909c1 (3.13). Treats the pad character as non-alphabet data per RFC 4648 section 3.3: the loop in binascii_a2b_base64 no longer breaks out on a pad sequence; a `pads` counter is added so post-loop validation still raises "Incorrect padding" for inputs that do not satisfy `quad_pos + pads == 4`. The unused `binascii_find_valid` helper is removed. - CVE-2026-3446 Moderate TuxCare License Agreement CVE-2026-3446 Ubuntu 20.04 LTS * SECURITY UPDATE: Modules/pyexpat.c conv_content_model could overflow the C stack when an Expat parser with a registered ElementDeclHandler parsed a deeply nested DTD content model, causing a denial-of-service. - debian/patches/CVE-2026-4224.patch: C-level backport of cpython eb0e8be3a7 (gh-145986, Stan Ulbrych + Bénédikt Tran). Wraps conv_content_model with Py_EnterRecursiveCall / Py_LeaveRecursiveCall so deep nesting raises RuntimeError instead of crashing. The upstream Lib/test/test_pyexpat.py test addition is skipped: it depends on test.support.infinite_recursion() which only exists in Python 3.x test.support. - CVE-2026-4224 * SECURITY UPDATE: Lib/Cookie.py Morsel accepts control characters in reserved-attribute values, in key/value/coded_value via .set(), and via the inherited dict.update() / pickle restoration paths, allowing newline-based HTTP header injection via Set-Cookie. The upstream CVE description and py3 fix target Lib/http/cookies.py (which does not exist in py2); a runtime POC confirmed the same vulnerability class is reachable through py2's Cookie module via five distinct write paths. - debian/patches/CVE-2026-0672-CVE-2026-3644.patch: py2 adaptation of cpython 95746b3a13 (gh-143919, Seth Larson) and 57e88c1cf9 (gh-145599, Stan Ulbrych + Victor Stinner). Adds a _has_control_character helper and validates at Morsel.__setitem__, .setdefault, .set, an explicit .update, an explicit .__setstate__, plus re-validates the assembled output in Morsel.js_output and BaseCookie.output (defence-in-depth against direct attribute mutation). The py3 __ior__ hunk is not ported (py2 dict has no `|=` operator). Doctest fixture `keebler="...fudge=\012;"` is updated to drop the embedded newline, mirroring the upstream doctest fix. - CVE-2026-0672, CVE-2026-3644 Moderate TuxCare License Agreement CVE-2026-3644 CVE-2026-4224 CVE-2026-0672 Ubuntu 20.04 LTS * SECURITY UPDATE: urllib.request.DataHandler accepted data: URLs whose mediatype contained control characters, allowing newline-based HTTP header injection downstream. - debian/patches/CVE-2025-15282.patch: backport of cpython f25509e78e (gh-143925, Seth Larson). Adds a [\\x00-\\x1F\\x7F] regex check in data_open() and a matching test_invalid_mediatype. - CVE-2025-15282 * SECURITY UPDATE: http.cookies.Morsel did not reject control characters in keys / values / coded_value, allowing cookie injection via __setitem__, setdefault, set, and BaseCookie.output. - debian/patches/CVE-2026-0672.patch: backport of cpython 95746b3a13 (gh-143919, Seth Larson). Adds _has_control_character helper and inserts validation in __setitem__, setdefault, set, plus a wrap of BaseCookie.OutputString / output. - CVE-2026-0672 * SECURITY UPDATE: the CVE-2026-0672 fix was incomplete; control characters could still bypass via Morsel.update(), |=, __setstate__ (pickle), and BaseCookie.js_output(). - debian/patches/CVE-2026-3644.patch: backport of cpython 57e88c1cf9 (gh-145599, Stan Ulbrych + Victor Stinner). Adds validation to Morsel.update(), defines explicit Morsel.__ior__ (was inherited from dict and bypassed validation), validates __setstate__ before assigning attributes, and re-validates the assembled output string in js_output(). - CVE-2026-3644 * SECURITY UPDATE: Modules/pyexpat.c conv_content_model could overflow the C stack when an Expat parser with a registered ElementDeclHandler parsed a deeply nested DTD content model, causing a denial-of-service. - debian/patches/CVE-2026-4224.patch: backport of cpython eb0e8be3a7 (gh-145986, Stan Ulbrych + Bénédikt Tran). Wraps conv_content_model with Py_EnterRecursiveCall / Py_LeaveRecursiveCall so deep nesting raises RecursionError instead of crashing. - CVE-2026-4224 Moderate TuxCare License Agreement CVE-2025-15282 CVE-2026-3644 CVE-2026-4224 CVE-2026-0672 Ubuntu 20.04 LTS * SECURITY UPDATE: CVE-2026-7210 + CVE-2026-41080 (paired) — backport the libexpat 16-byte salt API (XML_SetHashSalt16Bytes) into bundled expat 2.4.1 and wire pyexpat/_elementtree to use it. Together these restore proper hash-flood mitigation for xml.parsers.expat and xml.etree.ElementTree. - debian/patches/CVE-2026-7210.patch: backport of cpython 24b8f12544 (gh-149018, Stan Ulbrych). Adds a new 16-byte _Py_HashSecret.expat.hashsalt16 slot in Include/pyhash.h (overlapping the existing padding), extends the PyExpat CAPI in Include/pyexpat.h with SetHashSalt16Bytes, and prefers the new API in Modules/pyexpat.c and Modules/_elementtree.c when built against libexpat exposing it; falls back to the legacy XML_SetHashSalt path otherwise. The two XML_COMBINED_VERSION gates are extended with `|| defined(XML_HAS_HASHSALT16BYTES_BACKPORT)` so the new code path activates against the bundled patched libexpat without bumping its advertised version, while --with-system-expat builds (Alpine) keep the upstream `>= 20800` semantics. - debian/patches/CVE-2026-41080.patch: backport of libexpat PR #1183. Widens the parser's internal hash salt from `unsigned long m_hash_secret_salt` to a full `struct sipkey m_hash_secret_salt_128` (+ an m_hash_secret_salt_set flag), adds the new XML_SetHashSalt16Bytes API and the matching XML_HAS_HASHSALT16BYTES_BACKPORT marker in expat.h, and namespaces the new symbol via pyexpatns.h. Applied to bundled Modules/expat/; on Alpine `prepare()` deletes Modules/expat after the patch, so the libexpat backport is a no-op there and the system libexpat decides whether the new API is available. - CVE-2026-7210 - CVE-2026-41080 Critical TuxCare License Agreement CVE-2026-7210 Ubuntu 20.04 LTS * SECURITY UPDATE: CVE-2026-7210 + CVE-2026-41080 (paired): backport the libexpat 16-byte salt API (XML_SetHashSalt16Bytes) into bundled expat 2.2.8 and wire pyexpat/_elementtree to use it. Together these restore proper hash-flood mitigation. xml.parsers.expat and xml.etree.ElementTree previously used only the legacy 8-byte XML_SetHashSalt API; that salt is brute-forceable with modern hardware, allowing a crafted XML document to trigger hash collisions and a denial of service. - debian/patches/CVE-2026-7210.patch: backport of cpython 24b8f12544 (gh-149018, Stan Ulbrych). Switches pyexpat and _elementtree to XML_SetHashSalt16Bytes when built/linked against libexpat >= 2.8.0, falling back to the legacy XML_SetHashSalt on older expat. Adds a hashsalt16[16] field to _Py_HashSecret_t in Include/object.h (seeded by _PyRandom_Init alongside prefix / suffix) and a NULL-able SetHashSalt16Bytes function pointer in the pyexpat CAPI struct so _elementtree can dispatch at runtime. No upstream backport to 2.7 exists; upstream backports landed only to 3.14 / 3.15. - debian/patches/CVE-2026-41080.patch: backport of libexpat PR #1183 into the bundled Modules/expat/ tree (libexpat 2.2.8). Widens m_hash_secret_salt from `unsigned long` to a 128-bit `struct sipkey` and adds the new public XML_SetHashSalt16Bytes() entry point. Since pyexpat.so / _elementtree.so are statically linked against this tree, the cpython half now consumes full 16-byte entropy without requiring an external libexpat >= 2.8.0 at runtime. - CVE-2026-7210 - CVE-2026-41080 Critical TuxCare License Agreement CVE-2026-7210 Ubuntu 20.04 LTS * SECURITY UPDATE: tarfile applied AREGTYPE -> DIRTYPE normalization even during multi-block GNU long members (GNUTYPE_LONGNAME / GNUTYPE_LONGLINK), enabling a parsing differential vs. other tar implementations. - debian/patches/CVE-2025-13462.patch: backport of cpython 42d754e3 (gh-143934, Seth Larson + Eashwar Ranganathan). Threads a dircheck flag through frombuf / fromtarfile so normalization is skipped on the inner header during GNU long name / link handling. - CVE-2025-13462 * SECURITY UPDATE: wsgiref.headers.Headers did not reject control characters in header names / values, allowing HTTP header injection from WSGI applications. - debian/patches/CVE-2026-0865.patch: combined backport of cpython f7fceed7 (gh-143917) which adds the control-char regex check, 66da7bf6 (gh-143916 HTAB follow-up) which splits the check so HTAB is allowed in header values (RFC 9110 Section 5.5) but still rejected in header names, plus d931725b (gh-144370) which disallows control characters in status in wsgiref.handlers.start_response. - CVE-2026-0865 * SECURITY UPDATE: http.client did not reject CR/LF in HTTPConnection CONNECT tunnel host / per-tunnel-header values, enabling request injection through a proxy tunnel. - debian/patches/CVE-2026-1502.patch: backport of cpython 05ed7ce7 + b1cf9016 (gh-146212, Seth Larson). Adapted to 3.6's per-line self.send() form (no headers=[] list in _tunnel until 3.9+). Validates _tunnel_host and per-header name / value in _tunnel(). - CVE-2026-1502 * SECURITY UPDATE: http.cookies.Morsel.js_output() emitted an inline <script> snippet that only escaped " and left </script> intact, enabling HTML injection when a cookie value contains </script>. - debian/patches/CVE-2026-6019.patch: backport of cpython 76b3923d (gh-148848, Seth Larson). Base64-encodes the cookie value and emits document.cookie = atob("...") instead of pasting the raw cookie string into the JavaScript snippet. Composes on top of CVE-2026-3644's js_output() control-character recheck (preserved). - CVE-2026-6019 Moderate TuxCare License Agreement CVE-2025-4516 CVE-2025-13462 CVE-2026-1502 CVE-2024-50602 CVE-2024-11168 CVE-2026-0865 CVE-2025-8291 CVE-2025-6069 CVE-2025-1795 CVE-2025-0938 CVE-2026-6019 CVE-2025-11468 Ubuntu 20.04 LTS * SECURITY UPDATE: command injection via control characters in imaplib - debian/patches/CVE-2025-15366-CVE-2025-15367.patch: backport of cpython 6262704b (gh-143921, Seth Michael Larson). imaplib.IMAP4._command() concatenated each argument into the wire-level command without inspecting it, so user-controlled text (e.g. a username passed to IMAP4.login()) containing CR/LF or other control characters could inject a second IMAP command. Adds a module-level _control_chars regex to Lib/imaplib.py and a guard in _command() that rejects any argument containing a byte in [\x00-\x1F\x7F] with ValueError before concatenation. Adds a test_control_characters regression test to Lib/test/test_imaplib.py. - CVE-2025-15366 * SECURITY UPDATE: command injection via control characters in poplib - debian/patches/CVE-2025-15366-CVE-2025-15367.patch: backport of cpython b234a2b6 (gh-143923, Seth Michael Larson). poplib.POP3._putcmd() sent its argument to the server without inspecting it, so user-controlled text passed to user()/pass_()/apop()/rpop()/top() could inject a second POP3 command. Adds a guard in _putcmd() (Lib/poplib.py) that rejects any argument containing a byte in [\x00-\x1F\x7F] with ValueError before sending. Adds a test_control_characters regression test to Lib/test/test_poplib.py. - CVE-2025-15367 Important TuxCare License Agreement CVE-2025-15366 CVE-2025-15367 alt-python36 alt-python36-debug alt-python36-devel alt-python36-libs alt-python36-test alt-python36-tkinter alt-python36-tools alt-python27 alt-python27-debug alt-python27-devel alt-python27-idle alt-python27-libs alt-python27-test alt-python27-tkinter alt-python27-tools amd64 0:3.6.15-11 amd64 0:3.6.15-14 amd64 0:2.7.18-3 amd64 0:2.7.18-6 amd64 0:3.6.15-17 amd64 0:2.7.18-7 amd64 0:2.7.18-8 amd64 0:3.6.15-19 amd64 0:3.6.15-20 amd64 0:3.6.15-23 amd64 0:2.7.18-9 amd64 0:3.6.15-25 amd64 0:2.7.18-10 amd64 0:3.6.15-27 amd64 0:3.6.15-28 amd64 0:2.7.18-11 amd64 0:2.7.18-12 amd64 0:2.7.18-14 amd64 0:3.6.15-29 amd64 0:3.6.15-30 amd64 0:2.7.18-16 amd64 0:3.6.15-31 amd64 0:2.7.18-17 amd64 0:3.6.15-32 amd64 0:2.7.18-18 amd64 0:2.7.18-19 amd64 0:3.6.15-33 amd64 0:3.6.15-34 amd64 0:2.7.18-20 amd64 0:3.6.15-37 amd64 0:2.7.18-21