{"cve":"CVE-2026-49838","nvd":{"published":"2026-09-10T22:16:57.660","modified":"2026-09-16T13:42:46.970","status":"Deferred","description":"GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.7.0, GoBGP accepts a zero-length AS_PATH during UPDATE decoding and later panics while validating that attribute for a confederation eBGP peer. The vulnerable path is in the BGP UPDATE validator: a malformed UPDATE that should be rejected as a malformed AS_PATH instead reaches an unchecked `p.Value[0]` access, allowing a configured confederation eBGP peer to trigger a denial of service. Version 4.7.0 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:N/A:H","score":5.9},"cwes":["CWE-129"],"references":["https://github.com/osrg/gobgp/commit/4a319a6c25630fb3cdbda3e9ccfe56e702bdaaa0","https://github.com/osrg/gobgp/security/advisories/GHSA-frrj-87jh-2772"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:53.108888569+00:00"},"epss":{"cve":"CVE-2026-49838","score":0.00412,"percentile":0.35499,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-frrj-87jh-2772","url":"https://osv.dev/vulnerability/GHSA-frrj-87jh-2772","summary":"GoBGP confederation validation panics on empty AS_PATH attribute","modified":"2026-09-10T03:50:51.948030216Z","packages":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","purl":"pkg:golang/github.com/osrg/gobgp/v4","ranges":["<4.7.0"],"fixed":["4.7.0"]}]},{"id":"GO-2026-5954","url":"https://osv.dev/vulnerability/GO-2026-5954","summary":"GoBGP confederation validation panics on empty AS_PATH attribute in github.com/osrg/gobgp","modified":"2026-07-24T19:00:28.029267429Z","packages":[{"ecosystem":"Go","name":"github.com/osrg/gobgp/v4","purl":"pkg:golang/github.com/osrg/gobgp/v4","ranges":["<4.7.0"],"fixed":["4.7.0"]}]}],"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."]}