CVE-2026-12413 – IKEv2 Denial of Service via malformed fragmentation

CVE ID :CVE-2026-12413

Published : July 2, 2026, 9:19 p.m. | 27 minutes ago

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 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.

Severity: 7.5 | HIGH

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