{"id":"GO-2026-5955","revision":null,"records":[{"revision":"0d52e384d6e0458aad94ca3f256da4cd","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-49837","aliases":[],"title":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries","description":"GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Versions prior to 4.6.0 contain a BGP OPEN capability parsing issue where several concrete capability decoders may parse data from the full remaining capability buffer instead of the slice bounded by the declared capability length, `CapLen`. A malformed BGP OPEN message can cause bytes from a following capability to be interpreted as part of the current capability. The most security-relevant case is the 4-octet AS capability, where a capability with `CapLen == 0` may cause the parser to read bytes from the following capability as the 4-octet AS value. This parsed value may later affect peer AS validation during BGP session establishment. 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A malformed BGP OPEN message can cause bytes from a following capability to be interpreted as part of the current capability. The most security-relevant case is the 4-octet AS capability, where a capability with `CapLen == 0` may cause the parser to read bytes from the following capability as the 4-octet AS value. This parsed value may later affect peer AS validation during BGP session establishment. Version 4.6.0 patches the issue.","state":0,"publishedAt":"2026-09-10T22:16:57.507+00:00","modifiedAt":"2026-09-16T13:42:46.953+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/osrg/gobgp/commit/f02ca397821f6ca182ef4eb492c3cbc459552d7c","https://github.com/osrg/gobgp/security/advisories/GHSA-gjrg-jjr3-56cm"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-49837","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-125"],"productCriteria":[],"sourceDates":{"published":"2026-09-10T22:16:57.507","lastModified":"2026-09-16T13:42:46.953"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-49837","identifiers":["CVE-2026-49837"]},"retained":false,"historicalAffected":[]},{"revision":"1f569ee9804747cc8416de3c29c01aa3","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-gjrg-jjr3-56cm","aliases":["CVE-2026-49837","GO-2026-5955"],"title":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries","description":"### Summary\n    GoBGP contains a BGP OPEN capability parsing issue where several concrete capability decoders may parse data from the full remaining capability buffer instead of the slice bounded by the declared capability length, `CapLen`.\n    A malformed BGP OPEN message can cause bytes from a following capability to be interpreted as part of the current capability. The most security-relevant case is the 4-octet AS capability, where a capability with `CapLen == 0` may cause the parser to read bytes from the following capability as the 4-octet AS value. This parsed value may later affect peer AS validation during BGP session establishment.\n\n### Details\nThe issue is in the BGP OPEN capability parser under:\n\n- `pkg/packet/bgp/bgp.go`\n- `pkg/packet/bgp/validate.go`\n- \nThe BGP OPEN optional parameter capability format includes a capability code, a capability length field, and a capability value. Each concrete capability decoder should only parse bytes inside the declared capability value boundary.\nIn affected versions, the generic capability parser records the declared `CapLen`, but several concrete capability decoders continue parsing from the full remaining capability buffer after advancing past the two-byte capability header. Conceptually, the vulnerable pattern is:\n```go\ndata = data[2:]\n// decoder reads from data without first limiting it to CapLen\n\n### PoC\nThe following parser-level proof of concept demonstrates the issue without requiring a full BGP session or a running `bgpd` instance.\nThe malformed capability uses:\n- Capability Code: `65` (`BGP_CAP_FOUR_OCTET_AS_NUMBER`)\n- Declared `CapLen`: `0`\n- Four following bytes: `00 00 fd e8`\n\nAlthough the capability declares an empty value, affected versions parse the following four bytes as the 4-octet AS value `65000`.\n\n### Impact\nA remote peer that can send a malformed BGP OPEN message to a GoBGP instance may cause capability values to be parsed from outside their declared `CapLen` boundaries.\nIn the 4-octet AS capability case, this may affect:\n- peer AS validation;\n- capability negotiation;\n- interpretation of malformed OPEN messages;\n- acceptance or rejection decisions during BGP session establishment.\nThis issue does not appear to be arbitrary memory corruption, remote code execution, or information disclosure. It is a protocol parser boundary validation issue that can affect BGP OPEN validation semantics.","state":0,"publishedAt":"2026-07-09T23:20:57+00:00","modifiedAt":"2026-07-24T19:11:27.0190329+00:00","affected":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.6.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/osrg/gobgp/security/advisories/GHSA-gjrg-jjr3-56cm","https://github.com/osrg/gobgp"],"sourceUrl":"https://github.com/advisories/GHSA-gjrg-jjr3-56cm","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-gjrg-jjr3-56cm","identifiers":["GHSA-gjrg-jjr3-56cm","CVE-2026-49837","GO-2026-5955"]},"retained":false,"historicalAffected":[]},{"revision":"f479adee74b343ce8efcc29ed1703c1d","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5955","aliases":["CVE-2026-49837","GHSA-gjrg-jjr3-56cm"],"title":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries in github.com/osrg/gobgp","description":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries in github.com/osrg/gobgp","state":0,"publishedAt":"2026-07-24T18:35:55+00:00","modifiedAt":"2026-07-24T19:00:27.2700487+00:00","affected":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"4.6.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/osrg/gobgp/security/advisories/GHSA-gjrg-jjr3-56cm","https://github.com/osrg/gobgp/commit/f02ca397821f6ca182ef4eb492c3cbc459552d7c"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5955","license":"OSV · upstream source license applies","key":"osv:GO-2026-5955","identifiers":["GO-2026-5955","CVE-2026-49837","GHSA-gjrg-jjr3-56cm"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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