{"id":"CVE-2026-41643","aliases":["GHSA-8rxh-r2p6-7f2q","GO-2026-5266"],"url":"https://o3.security/vulnerability/CVE-2026-41643","summary":"GoBGP: Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE","details":"GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, a remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled. This issue has been patched in version 4.3.0.","published":"2026-05-07T11:53:23.566Z","modified":"2026-08-07T11:50:38.795470546Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00542,"percentile":0.42617,"asOf":"2026-08-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","fixedVersion":"4.3.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/osrg/gobgp/releases/tag/v4.3.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41643.json"},{"type":"ADVISORY","url":"https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41643"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:50:38.795470546Z"}}