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 Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libreswan | Jul 27, 2026 | Jul 27, 2026 |
| Alpine Linux | — | Upgrade libreswan | Sep 28, 2026 | Jul 2, 2026 |
| Amazon_linux_2023 | — | Upgrade libreswan-debuginfoUpgrade libreswanUpgrade libreswan-debugsource | Aug 10, 2026 | Jul 2, 2026 |
| Redhat Openshift | — | Upgrade rhcos | Sep 11, 2026 | Jun 24, 2026 |
| Redhat_linux | — | Upgrade libreswan-debuginfoUpgrade libreswan-minimal-debuginfoUpgrade libreswan-minimalUpgrade libreswanUpgrade libreswan-debugsource | Jul 17, 2026 | Jun 24, 2026 |
| Rocky_linux | — | Upgrade libreswanUpgrade libreswan-debuginfoUpgrade libreswan-debugsource | Jul 29, 2026 | Jul 27, 2026 |
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