CVE-2026-12413

Name	CVE-2026-12413
Description	An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of service. The function reassemble_v2_incoming_fragments() would ignore unknown outer payloads but still store these in a fixed size array msg_digest.digest[PAYLIMIT]. An off-by-one error in the assertion PASSERT(logger, md->digest_roof < elemsof(md->digest)) causes the daemon to abort. No remote code execution is possible. Any configuration that allows IKEv2 connections that do not set fragmentation=no are vulnerable. IKEv1 is not affected.
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
libreswan (PTS)	bullseye	4.3-1+deb11u4	vulnerable
	bullseye (security)	4.3-1+deb11u3	vulnerable
	bookworm	4.10-2+deb12u1	vulnerable
	trixie	5.2-2.2	vulnerable
	forky, sid	5.2-2.4	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libreswan	source	(unstable)	(unfixed)

https://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt
Patches: https://libreswan.org/security/CVE-2026-12413/