CVE-2026-12413
IKEv2 Denial of Service via malformed fragmentation
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.
INFO
Published Date :
July 2, 2026, 9:19 p.m.
Last Modified :
July 2, 2026, 9:19 p.m.
Remotely Exploit :
Yes !
Source :
libreswan
Affected Products
The following products are affected by CVE-2026-12413
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | d42dc95b-23f1-4e06-9076-20753a0fb0df |
Solution
- Configure fragmentation=no for IKEv2 connections.
- Update Libreswan to the latest version.
- Restart the pluto daemon after applying changes.
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CVE-2026-12413 vulnerability anywhere in the article.