{
  "document": {
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      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      },
      {
        "category": "details",
        "text": "* Fix CVE-2026-66032 (sftp_open double-free of the status buffer),\n     CVE-2026-66033 (AES-GCM length underflow in _libssh2_cipher_crypt),\n     CVE-2026-66034 (publickey.c comment_len OOB read),\n     CVE-2026-66035 (ETM heap overflow in fullpacket)\n   * Fix length underflow on short chacha20-poly1305 packets\n     (no CVE, GHSA-x4g5-mgfc-cxvv, upstream 15257c08 / #2389)",
        "title": "Details"
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      "generator": {
        "date": "2026-10-14T12:36:34Z",
        "engine": {
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      "id": "CLSA-2026:1791981329",
      "initial_release_date": "2026-10-14T12:36:34Z",
      "revision_history": [
        {
          "date": "2026-10-14T12:36:34Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-66032, CVE-2026-66033, CVE-2026-66034, CVE-2026-66035"
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        "category": "vendor",
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      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "description",
          "text": "libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit the underflow in the expression computing blocksize minus aadlen minus authentication tag length to trigger an out-of-bounds read and a memcpy call with a near-SIZE_MAX length argument, causing immediate process crash before any authentication occurs.",
          "title": "Vulnerability description"
        }
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          "Debian-13:alt-libssh2-0:1.11.1-1.7.arm64",
          "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.amd64",
          "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.arm64"
        ]
      },
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-common/cve/CVE-2026-66033"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/commit/a2ed82d40964bbc0d64cd717aa0a5a892117d2e6",
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        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/pull/2401",
          "url": "https://github.com/libssh2/libssh2/pull/2401"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/libssh2-integer-underflow-dos-via-aes-gcm-cipher-negotiation",
          "url": "https://www.vulncheck.com/advisories/libssh2-integer-underflow-dos-via-aes-gcm-cipher-negotiation"
        }
      ],
      "release_date": "2026-07-24T17:17:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-14T12:35:31.694365Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1791981329",
          "product_ids": [
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            "Debian-13:alt-libssh2-0:1.11.1-1.8.arm64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.amd64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.arm64"
          ],
          "url": "https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1791981329"
        },
        {
          "category": "none_available",
          "date": "2026-07-24T17:17:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-13:alt-libssh2-0:1.11.1-1.7.amd64",
            "Debian-13:alt-libssh2-0:1.11.1-1.7.arm64",
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          "details": "Important"
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    {
      "cve": "CVE-2026-66035",
      "cwe": {
        "id": "CWE-122",
        "name": "Heap-based Buffer Overflow"
      },
      "notes": [
        {
          "category": "description",
          "text": "libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer overflow vulnerability that allows a malicious SSH server to corrupt heap metadata in any connecting client by sending a packet with a packet_length smaller than the cipher's block size during Encrypt-then-MAC cipher negotiation. In the fullpacket() function in src/transport.c, the ETM path allocates a buffer of packet_length bytes but copies blocksize minus one bytes via memcpy, causing an overflow that on 32-bit glibc writes attacker-controlled bytes into an adjacent chunk's SIZE field, enabling tcache bin confusion, overlapping live objects, and function pointer overwrite during the session handshake before authentication.",
          "title": "Vulnerability description"
        }
      ],
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          "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.arm64"
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-common/cve/CVE-2026-66035"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4",
          "url": "https://github.com/libssh2/libssh2/commit/42e33d81577ed4b95d4b4f6f845e5ee8efe5eeb4"
        },
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          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/pull/2198",
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        },
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          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/libssh2-heap-buffer-overflow-via-etm-cipher-negotiation",
          "url": "https://www.vulncheck.com/advisories/libssh2-heap-buffer-overflow-via-etm-cipher-negotiation"
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      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-14T12:35:31.694365Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1791981329",
          "product_ids": [
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            "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.arm64"
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        },
        {
          "category": "none_available",
          "date": "2026-07-24T17:17:00Z",
          "details": "Affected",
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            "Debian-13:alt-libssh2-0:1.11.1-1.7.amd64",
            "Debian-13:alt-libssh2-0:1.11.1-1.7.arm64",
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          "details": "Important"
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        "id": "CWE-415",
        "name": "Double Free"
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        {
          "category": "description",
          "text": "libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open() function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.",
          "title": "Vulnerability description"
        }
      ],
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          "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.arm64"
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          "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.arm64"
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      "references": [
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-common/cve/CVE-2026-66032"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0",
          "url": "https://github.com/libssh2/libssh2/commit/5e4776146552d898b9c0e1b313cd093fa8dc92d0"
        },
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          "category": "external",
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          "url": "https://github.com/libssh2/libssh2/pull/2180"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/libssh2-double-free-heap-corruption-via-sftp-open",
          "url": "https://www.vulncheck.com/advisories/libssh2-double-free-heap-corruption-via-sftp-open"
        }
      ],
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      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-14T12:35:31.694365Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1791981329",
          "product_ids": [
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            "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.arm64"
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          "url": "https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1791981329"
        },
        {
          "category": "none_available",
          "date": "2026-07-24T17:17:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-13:alt-libssh2-0:1.11.1-1.7.amd64",
            "Debian-13:alt-libssh2-0:1.11.1-1.7.arm64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.amd64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.arm64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    },
    {
      "cve": "CVE-2026-66034",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
      },
      "notes": [
        {
          "category": "description",
          "text": "libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1 response parser reads a server-controlled comment_len value and advances the parse pointer without verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup path frees an uninitialized pointer from a non-zeroed realloc() region.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "fixed": [
          "Debian-13:alt-libssh2-0:1.11.1-1.8.amd64",
          "Debian-13:alt-libssh2-0:1.11.1-1.8.arm64",
          "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.amd64",
          "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.arm64"
        ],
        "known_affected": [
          "Debian-13:alt-libssh2-0:1.11.1-1.7.amd64",
          "Debian-13:alt-libssh2-0:1.11.1-1.7.arm64",
          "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.amd64",
          "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.arm64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els-alt-common/cve/CVE-2026-66034"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99803cd898d9",
          "url": "https://github.com/libssh2/libssh2/commit/a13bb6c773f0d55ad1628cede57e99803cd898d9"
        },
        {
          "category": "external",
          "summary": "https://github.com/libssh2/libssh2/pull/2202",
          "url": "https://github.com/libssh2/libssh2/pull/2202"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/libssh2-heap-out-of-bounds-read-via-publickey-subsystem",
          "url": "https://www.vulncheck.com/advisories/libssh2-heap-out-of-bounds-read-via-publickey-subsystem"
        }
      ],
      "release_date": "2026-07-24T17:17:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-14T12:35:31.694365Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1791981329",
          "product_ids": [
            "Debian-13:alt-libssh2-0:1.11.1-1.8.amd64",
            "Debian-13:alt-libssh2-0:1.11.1-1.8.arm64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.amd64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.8.arm64"
          ],
          "url": "https://cve.tuxcare.com/els-alt-common/releases/CLSA-2026:1791981329"
        },
        {
          "category": "none_available",
          "date": "2026-07-24T17:17:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-13:alt-libssh2-0:1.11.1-1.7.amd64",
            "Debian-13:alt-libssh2-0:1.11.1-1.7.arm64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.amd64",
            "Debian-13:alt-libssh2-dev-0:1.11.1-1.7.arm64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}