CVE-2026-77205
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.
- Score
- CVSS 3.1 3.7 Low
- Status
- Awaiting Analysis - d42dc95b-23f1-4e06-9076-20753a0fb0df
- Published
- 2026-10-13
- Last modified
- 2026-10-16
- Weaknesses
- CWE-772
Affected products
References
- https://libreswan.org/security/CVE-2026-77205/CVE-2026-77205.txt
- https://libreswan.org/security/CVE-2026-77205/
- https://libreswan.org/security/CVE-2026-14957/CVE-2026-14957.txt
