{"id":"CVE-2026-77205","title":"Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted from the NSS cache","summary":"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…","severity":"low","cvss":3.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-772"],"published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T22:18:24.577","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77205","references":[{"url":"https://libreswan.org/security/CVE-2026-14957/CVE-2026-14957.txt","label":"d42dc95b-23f1-4e06-9076-20753a0fb0df"},{"url":"https://libreswan.org/security/CVE-2026-77205/","label":"d42dc95b-23f1-4e06-9076-20753a0fb0df"},{"url":"https://libreswan.org/security/CVE-2026-77205/CVE-2026-77205.txt","label":"d42dc95b-23f1-4e06-9076-20753a0fb0df"}],"tags":["nvd"],"ingestedAt":"2026-10-13T23:03:54.749Z","slug":"CVE-2026-77205","body":"## Overview\n\nLibreswan 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":20,"depthScoreParts":{"impact":20.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}