libreswan: Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted fro...
CVE-2026-77205 is fixed in 2 products on 1 platform, first by RHSA-2026:89923, released October 27, 2026. It is not reported as exploited. Patch Radar priority: High.
Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted from the NSS cache. As a result, any real certificates with the same serial number are rejected as well. This can be abused to lock out legitimate peers from connecting. The add_decoded_cert() function missed a call to CERT_DestroyCertificate() due to an incorrect fix for CVE-2026-14957. Sending bogus certificates with new serial numbers could prevent the real certificates with those serial numbers from connecting until the service has restarted.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libreswan · RHEL 10 | 5.3.3-1.el10_2 | RHSA-2026:89923 | Oct 27, 2026 |
| libreswan · almalinux 10 | 5.3.3-1.el10_2 | ALSA-2026:89923 | Nov 7, 2026 |
| libreswan · ol 10 | 0:5.3.3-1.0.1.el10_2 | ELSA-2026-89923 | Nov 7, 2026 |
| libreswan · rocky 10 | 0:5.3.3-1.el10_2 | RLSA-2026:89923 | Nov 7, 2026 |
| libreswan-minimal · almalinux 10 | 5.3.3-1.el10_2 | ALSA-2026:89923 | Nov 7, 2026 |
| libreswan-minimal · ol 10 | 0:5.3.3-1.0.1.el10_2 | ELSA-2026-89923 | Nov 7, 2026 |
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