{"cve":"CVE-2026-49837","nvd":{"published":"2026-09-10T22:16:57.507","modified":"2026-09-16T13:42:46.953","status":"Deferred","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. Version 4.6.0 patches the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","score":5.9},"cwes":["CWE-125"],"references":["https://github.com/osrg/gobgp/commit/f02ca397821f6ca182ef4eb492c3cbc459552d7c","https://github.com/osrg/gobgp/security/advisories/GHSA-gjrg-jjr3-56cm"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:53.108888569+00:00"},"epss":{"cve":"CVE-2026-49837","score":0.00332,"percentile":0.26422,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gjrg-jjr3-56cm","url":"https://osv.dev/vulnerability/GHSA-gjrg-jjr3-56cm","summary":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries","modified":"2026-07-24T19:11:27.019032898Z","packages":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","purl":"pkg:golang/github.com/osrg/gobgp/v4","ranges":["<4.6.0"],"fixed":["4.6.0"]}]},{"id":"GO-2026-5955","url":"https://osv.dev/vulnerability/GO-2026-5955","summary":"GoBGP: BGP OPEN capability parser may read capability values outside declared CapLen boundaries in github.com/osrg/gobgp","modified":"2026-07-24T19:00:27.270048744Z","packages":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","purl":"pkg:golang/github.com/osrg/gobgp/v4","ranges":["<4.6.0"],"fixed":["4.6.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}