{ "document": { "category": "csaf_vex", "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" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/centos6els/vex/2026/cve-2026-63383-els_os-centos6els.json" } ], "tracking": { "current_release_date": "2026-10-24T07:01:08Z", "generator": { "date": "2026-10-24T07:01:08Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-63383-ELS_OS-CENTOS6ELS", "initial_release_date": "2026-08-20T18:16:00Z", "revision_history": [ { "date": "2026-08-20T18:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-24T01:23:16Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-10-24T07:01:08Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2026-63383" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 6", "product": { "name": "Community Enterprise Operating System 6", "product_id": "CentOS-6", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686", "product": { "name": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686", "product_id": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-devel@1.4.13-4.el6.tuxcare.els2?arch=i686" } } }, { "category": "product_version", "name": "libevent-0:1.4.13-4.el6.tuxcare.els2.i686", "product": { "name": "libevent-0:1.4.13-4.el6.tuxcare.els2.i686", "product_id": "libevent-0:1.4.13-4.el6.tuxcare.els2.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent@1.4.13-4.el6.tuxcare.els2?arch=i686" } } } ], "category": "architecture", "name": "i686" }, { "branches": [ { "category": "product_version", "name": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64", "product": { "name": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64", "product_id": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-devel@1.4.13-4.el6.tuxcare.els2?arch=x86_64" } } }, { "category": "product_version", "name": "libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64", "product": { "name": "libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64", "product_id": "libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent@1.4.13-4.el6.tuxcare.els2?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch", "product": { "name": "libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch", "product_id": "libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-headers@1.4.13-4.el6.tuxcare.els2?arch=noarch" } } }, { "category": "product_version", "name": "libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch", "product": { "name": "libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch", "product_id": "libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-doc@1.4.13-4.el6.tuxcare.els2?arch=noarch" } } } ], "category": "architecture", "name": "noarch" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686" }, "product_reference": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64" }, "product_reference": "libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch" }, "product_reference": "libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64" }, "product_reference": "libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-0:1.4.13-4.el6.tuxcare.els2.i686 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:libevent-0:1.4.13-4.el6.tuxcare.els2.i686" }, "product_reference": "libevent-0:1.4.13-4.el6.tuxcare.els2.i686", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch" }, "product_reference": "libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch", "relates_to_product_reference": "CentOS-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-63383", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "description", "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent can read beyond a contiguous evbuffer region in event_tagging.c when decode_tag_internal requests at most five bytes from evbuffer_pullup but iterates using the full logical buffer length. A fragmented evbuffer containing a six-byte malformed tag can therefore advance past the pullup window and trigger an out-of-bounds read, which can crash a process that decodes attacker-controlled tagged RPC data. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.", "title": "Vulnerability description" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "CentOS-6:libevent-0:1.4.13-4.el6.tuxcare.els2.i686", "CentOS-6:libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64", "CentOS-6:libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686", "CentOS-6:libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64", "CentOS-6:libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch", "CentOS-6:libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63383" }, { "category": "external", "summary": "https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321", "url": "https://github.com/libevent/libevent/commit/91ed8745eebabdd27592a83d350338a8c4626321" }, { "category": "external", "summary": "https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc75180cb", "url": "https://github.com/libevent/libevent/commit/e1f9e21887c6b104e206a718385ba3ffc75180cb" }, { "category": "external", "summary": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable", "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable" }, { "category": "external", "summary": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha", "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha" }, { "category": "external", "summary": "https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6", "url": "https://github.com/libevent/libevent/security/advisories/GHSA-fj29-64w6-73h6" } ], "release_date": "2026-08-20T18:16:00Z", "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "date": "2026-10-24T01:49:49.958247Z", "details": "unknown", "product_ids": [ "CentOS-6:libevent-0:1.4.13-4.el6.tuxcare.els2.i686", "CentOS-6:libevent-0:1.4.13-4.el6.tuxcare.els2.x86_64", "CentOS-6:libevent-devel-0:1.4.13-4.el6.tuxcare.els2.i686", "CentOS-6:libevent-devel-0:1.4.13-4.el6.tuxcare.els2.x86_64", "CentOS-6:libevent-doc-0:1.4.13-4.el6.tuxcare.els2.noarch", "CentOS-6:libevent-headers-0:1.4.13-4.el6.tuxcare.els2.noarch" ] } ] } ] }