CVE-2026-12413
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.
How to fix
- libreswan libreswan5.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libreswan libreswan | 4.6 ≤ v < 5.3.1 | 5.3.1 |
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