CVE-2026-41643: GoBGP has Remote Denial of Service (Panic) in UpdatePathAttrs4ByteAs via Malformed BGP UPDATE

April 29, 2026 (updated May 8, 2026)

A remote Denial of Service (DoS) vulnerability exists in GoBGP where a malformed BGP UPDATE message can trigger a runtime error: index out of range panic. This occurs during the processing of 4-byte AS attributes when the message structure causes an internal slice index shift that is not properly handled.

References

github.com/advisories/GHSA-8rxh-r2p6-7f2q
github.com/osrg/gobgp
github.com/osrg/gobgp/releases/tag/v4.3.0
github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q
nvd.nist.gov/vuln/detail/CVE-2026-41643

Code Behaviors & Features

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