CVE-2026-12413: high-severity vulnerability in The Libreswan Project libreswan
IKEv2 Denial of Service via malformed fragmentation
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.6%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
The Libreswan Project · libreswanRelated CVEs — The Libreswan Project libreswan
In the same product, most dangerous first.
CVE-2026-77206HIGHIKEv2 pre-authentication Null Pointer Dereference in EAP codeEPSS 0.7%CVE-2026-14957HIGHFIPS mode assertion failure via malicious CERT payloadEPSS 0.5%CVE-2026-77207HIGHNull Pointer Dereference in PKCS#7 bundle with no certificatesEPSS 0.5%CVE-2026-94453HIGHIKEv2 Use-After-Free bug when using IKE-over-TCPEPSS 0.5%CVE-2026-50721HIGHIKEv1 Denial of Service via RSA-SHA1 (PKCS#1 Version 1.5 Encrypted) authentication payloadEPSS 0.4%CVE-2026-50722HIGHIKEv2 Denial of Service via RSA-SHA1 (PKCS#1 RSASSA-PKCS1-v1_5) authentication payloadEPSS 0.3%