CVE-2026-41643

Name	CVE-2026-41643
Description	GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Prior to version 4.3.0, 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. This issue has been patched in version 4.3.0.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
gobgp (PTS)	bullseye	2.25.0-2	vulnerable
	bookworm	3.10.0-1	vulnerable
	trixie	3.36.0-2	vulnerable
	forky	4.4.0-1	fixed
	sid	4.5.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
gobgp	source	(unstable)	4.3.0-1

https://github.com/osrg/gobgp/security/advisories/GHSA-8rxh-r2p6-7f2q