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Change History

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.

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-193

CWE-617

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

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

[{"vendor":"The Libreswan Project","product":"libreswan","defaultStatus":"unaffected","versions":[{"version":"4.6","lessThanOrEqual":"5.3","versionType":"semver","status":"affected"},{"version":"5.3.1","versionType":"semver","status":"unaffected"}]}]