CVE-2026-41642: GoBGP has Remote Denial of Service (Panic) via Malformed Well-known Path Attribute

April 29, 2026 (updated May 8, 2026)

A remote Denial of Service (DoS) vulnerability exists in GoBGP due to a nil pointer dereference. When a malformed BGP UPDATE message contains an unrecognized Path Attribute marked as “Well-known,” the daemon fails to interrupt the message handling flow. This results in an illegal memory access and a full process crash (panic).

References

github.com/advisories/GHSA-7235-89m6-f4px
github.com/osrg/gobgp
github.com/osrg/gobgp/releases/tag/v4.4.0
github.com/osrg/gobgp/security/advisories/GHSA-7235-89m6-f4px
nvd.nist.gov/vuln/detail/CVE-2026-41642

Code Behaviors & Features

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