CVE-2026-12413
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| The Libreswan Project | libreswan | 4.6 <= 5.3 | affected |
| The Libreswan Project | libreswan | 5.3.1 | unaffected |
Weaknesses
- CWE-193: Off-by-one Error
- CWE-617: Reachable Assertion
Workarounds
If fragmentation is not needed, fragmentation=no can be added to all IKEv2 configurations. If fragmentation is needed, no workaround is possible and the fix needs to be applied.
References
- https://libreswan.org/security/CVE-2026-12413/CVE-2026-12413.txt
- https://libreswan.org/security/CVE-2026-12413/
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