{ "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/cloudlinux7els/vex/2026/cve-2026-63388-els_os-cloudlinux7els.json" } ], "tracking": { "current_release_date": "2026-11-03T12:52:02Z", "generator": { "date": "2026-11-03T12:52:02Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-63388-ELS_OS-CLOUDLINUX7ELS", "initial_release_date": "2026-08-20T18:16:00Z", "revision_history": [ { "date": "2026-08-20T18:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-21T13:12:36Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-10-23T09:27:53Z", "number": "3", "summary": "Update document" }, { "date": "2026-11-03T12:52:02Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" }, "title": "Security update on CVE-2026-63388" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "CloudLinux 7", "product": { "name": "CloudLinux 7", "product_id": "CloudLinux-7", "product_identification_helper": { "cpe": "cpe:2.3:o:cloudlinux:cloudlinux:7:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "CloudLinux" } ], "category": "vendor", "name": "Cloud Linux Software, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64", "product": { "name": "libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64", "product_id": "libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent@2.0.21-4.el7.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": 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"pkg:rpm/cloudlinux/libevent-devel@2.0.21-4.el7.tuxcare.els2?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "libevent-0:2.0.21-4.el7.tuxcare.els1.i686", "product": { "name": "libevent-0:2.0.21-4.el7.tuxcare.els1.i686", "product_id": "libevent-0:2.0.21-4.el7.tuxcare.els1.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent@2.0.21-4.el7.tuxcare.els1?arch=i686" } } }, { "category": "product_version", "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686", "product": { "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686", "product_id": "libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-devel@2.0.21-4.el7.tuxcare.els1?arch=i686" } } }, { "category": "product_version", "name": "libevent-0:2.0.21-4.el7.tuxcare.els2.i686", "product": { "name": "libevent-0:2.0.21-4.el7.tuxcare.els2.i686", "product_id": "libevent-0:2.0.21-4.el7.tuxcare.els2.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent@2.0.21-4.el7.tuxcare.els2?arch=i686" } } }, { "category": "product_version", "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686", "product": { "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686", "product_id": "libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-devel@2.0.21-4.el7.tuxcare.els2?arch=i686" } } } ], "category": "architecture", "name": "i686" }, { "branches": [ { "category": "product_version", "name": "libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch", "product": { "name": "libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch", "product_id": "libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-doc@2.0.21-4.el7.tuxcare.els1?arch=noarch" } } }, { "category": "product_version", "name": "libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch", "product": { "name": "libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch", "product_id": "libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/libevent-doc@2.0.21-4.el7.tuxcare.els2?arch=noarch" } } } ], "category": "architecture", "name": "noarch" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64" }, "product_reference": "libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-0:2.0.21-4.el7.tuxcare.els1.i686 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els1.i686" }, "product_reference": "libevent-0:2.0.21-4.el7.tuxcare.els1.i686", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch" }, "product_reference": "libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686" }, "product_reference": "libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els1.x86_64 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els1.x86_64" }, "product_reference": "libevent-devel-0:2.0.21-4.el7.tuxcare.els1.x86_64", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-0:2.0.21-4.el7.tuxcare.els2.x86_64 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els2.x86_64" }, "product_reference": "libevent-0:2.0.21-4.el7.tuxcare.els2.x86_64", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-0:2.0.21-4.el7.tuxcare.els2.i686 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els2.i686" }, "product_reference": "libevent-0:2.0.21-4.el7.tuxcare.els2.i686", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch" }, "product_reference": "libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els2.x86_64 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els2.x86_64" }, "product_reference": "libevent-devel-0:2.0.21-4.el7.tuxcare.els2.x86_64", "relates_to_product_reference": "CloudLinux-7" }, { "category": "default_component_of", "full_product_name": { "name": "libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686 as a component of CloudLinux 7", "product_id": "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686" }, "product_reference": "libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686", "relates_to_product_reference": "CloudLinux-7" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-63388", "cwe": { "id": "CWE-617", "name": "Reachable Assertion" }, "notes": [ { "category": "description", "text": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a heap out-of-bounds write in bufferevent_sock.c when bufferevent_socket_set_conn_address_ copies a kernel-supplied AF_UNIX peer address into bufferevent_private.conn_address. Release builds compiled with NDEBUG disable the EVUTIL_ASSERT length guard, and the evhttp accept path can pass a 110-byte sockaddr from accept() into the 28-byte field. An unauthenticated local peer able to connect to an AF_UNIX listener can overwrite the adjacent dns_request pointer and heap data, causing memory corruption with confidentiality, integrity, and availability impact. 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": [ "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els1.i686", "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64", "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els2.i686", "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els2.x86_64", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els1.x86_64", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els2.x86_64", "CloudLinux-7:libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch", "CloudLinux-7:libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-63388" }, { "category": "external", "summary": "https://github.com/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9", "url": "https://github.com/libevent/libevent/commit/52057cb33d0c20c0a0453fbabe6c0c96854931b9" }, { "category": "external", "summary": "https://github.com/libevent/libevent/commit/ef38f926e9cd1f082416c6fff13587bc1f431d72", "url": "https://github.com/libevent/libevent/commit/ef38f926e9cd1f082416c6fff13587bc1f431d72" }, { "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-cvq5-vrvr-j338", "url": "https://github.com/libevent/libevent/security/advisories/GHSA-cvq5-vrvr-j338" } ], "release_date": "2026-08-20T18:16:00Z", "threats": [ { "category": "impact", "details": "Moderate" }, { "category": "impact", "date": "2026-11-03T09:47:37.523295Z", "details": "Not affected: the vulnerable connection address code was added in libevent 2.1, and this package is based on 2.0.21, which does not contain it.", "product_ids": [ "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els1.i686", "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els1.x86_64", "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els2.i686", "CloudLinux-7:libevent-0:2.0.21-4.el7.tuxcare.els2.x86_64", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els1.i686", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els1.x86_64", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els2.i686", "CloudLinux-7:libevent-devel-0:2.0.21-4.el7.tuxcare.els2.x86_64", "CloudLinux-7:libevent-doc-0:2.0.21-4.el7.tuxcare.els1.noarch", "CloudLinux-7:libevent-doc-0:2.0.21-4.el7.tuxcare.els2.noarch" ] } ] } ] }