{"id":"CVE-2026-41642","title":"github.com/osrg/gobgp: GoBGP: Denial of Service via malformed BGP UPDATE message (CVE-2026-41642)","summary":"A flaw was found in GoBGP 4.3.0. A malformed BGP UPDATE with an unrecognized Path Attribute marked as well-known is not rejected cleanly, triggering a nil pointer dereference that crashes the GoBGP daemon. Fixed in GoBGP 4.4.0.","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-476","vendor":"Red Hat","product":"github.com/osrg/gobgp/v4","affected":["github.com/osrg/gobgp/v4 >= 4.3.0, < 4.4.0"],"patched":["github.com/osrg/gobgp/v4 4.4.0"],"published":"2026-05-07","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:05:07+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41642.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41642.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-41642"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2467703"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-41642"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41642"},{"url":"https://github.com/osrg/gobgp/releases/tag/v4.4.0"},{"url":"https://github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px"},{"url":"https://github.com/osrg/gobgp"}],"tags":["csaf","vex","red-hat","osv","go"],"epss":0.00503,"epssPercentile":0.42065,"aliases":["GHSA-7235-89m6-f4px","GO-2026-5198"],"ecosystem":"go","ingestedAt":"2026-07-25T19:08:11.125Z","slug":"CVE-2026-41642","body":"## Overview\n\nA flaw was found in GoBGP 4.3.0. A malformed BGP UPDATE with an unrecognized Path Attribute marked as well-known is not rejected cleanly, triggering a nil pointer dereference that crashes the GoBGP daemon. Fixed in GoBGP 4.4.0.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41642.json)\n\n**github.com/osrg/gobgp: GoBGP: Denial of Service via malformed BGP UPDATE message** — rated Important by Red Hat. Released 2026-05-07, updated 2026-09-18.\n\nNot affected:\n\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nRefer to the advisory for fix availability.\n\n## Package advisory (CVE-2026-41642)\n\nAffected packages:\n\n- `github.com/osrg/gobgp/v4 >= 4.3.0, < 4.4.0`\n\nPatched in:\n\n- `github.com/osrg/gobgp/v4 4.4.0`\n\nSource: https://osv.dev/vulnerability/GHSA-7235-89m6-f4px","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}