CVE-2026-12413
CVE-2026-12413 · IKEv2 Denial of Service via malformed fragmentation
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 7.5 · High · EPSS 0.6% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
libreswan
- Versions
- ≥ 4.6, ≤ 5.3: Affected (semver)
- 5.3.1: Not affected (semver)
No fix published
libreswan Debian:12
- Versions
- 4.10-2
- 4.10-2+deb12u1
- 4.11-1
- 4.12-1
- 4.12-2
- 4.12-3
- 4.14-1
- 4.14-1.1
- 4.15-1
- 5.0~rc2-1
- 5.0~rc2-2
- 5.2-1
- 5.2-2
- 5.2-2.1
- 5.2-2.2
- 5.2-2.3
- 5.2-2.4
- 5.2-2.5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Debian:13
- Versions
- 5.2-2.2
- 5.2-2.3
- 5.2-2.4
- 5.2-2.5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Debian:14
- Versions
- 5.2-2.2
- 5.2-2.3
- 5.2-2.4
- Affected ranges
- ECOSYSTEM: < 5.2-2.5
Update to 5.2-2.5
libreswan Ubuntu:18.04:LTS
- Versions
- 3.20-7build1
- 3.21-2
- 3.22-1
- 3.22-2
- 3.22-3
- 3.22-4
- 3.23-1
- 3.23-4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Ubuntu:20.04:LTS
- Versions
- 3.29-2
- 3.29-2build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Ubuntu:22.04:LTS
- Versions
- 3.32-3ubuntu3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Ubuntu:24.04:LTS
- Versions
- 4.11-1ubuntu1
- 4.12-1ubuntu1
- 4.14-1ubuntu1
- 4.14-1ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Ubuntu:25.10
- Versions
- 4.14-1ubuntu2
- 5.2-2.2ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Ubuntu:26.10
- Versions
- 5.2-2.2ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libreswan Ubuntu:26.04:LTS
- Versions
- 5.2-2.2ubuntu1
- 5.2-2.2ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published