CVE WatchJul 8, 2026

CVE-2026-12413

An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploitation would cause a denial of

CVSS

7.5

High

EPSS

0.6%

p45

KEV

—

Exploit Today

0-100

Published: Jul 2, 2026 · Last modified: Jul 8, 2026 · CWE-193 · CWE-617

EPSS · 30d

0.6%EPSS · 30 days0.6%

2026-07-042026-07-16

Technical 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.

Official references

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