CVE-2026-49838

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.

References

https://github.com/osrg/gobgp/security/advisories/GHSA-frrj-87jh-2772

https://github.com/osrg/gobgp/commit/4a319a6c25630fb3cdbda3e9ccfe56e702bdaaa0

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-75807

Details

Source: Mitre, NVD

Named Vulnerability: GO-2026-5954Named Vulnerability: GHSA-frrj-87jh-2772

Risk Information

CVSS v2

CVSS v3

EPSS