{"id":"UBUNTU-CVE-2026-77205","details":"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.","modified":"2026-10-17T13:01:07.367756344Z","published":"2026-10-13T22:18:00Z","upstream":["CVE-2026-77205"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-77205"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-77205"},{"type":"REPORT","url":"https://libreswan.org/security/CVE-2026-14957/CVE-2026-14957.txt"},{"type":"REPORT","url":"https://libreswan.org/security/CVE-2026-77205/"},{"type":"REPORT","url":"https://libreswan.org/security/CVE-2026-77205/CVE-2026-77205.txt"}],"affected":[{"package":{"name":"libreswan","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libreswan?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.20-7build1","3.21-2","3.22-1","3.22-2","3.22-3","3.22-4","3.23-1","3.23-4"],"ecosystem_specific":{"binaries":[{"binary_version":"3.23-4","binary_name":"libreswan"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77205.json"}},{"package":{"name":"libreswan","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libreswan?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.29-2","3.29-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libreswan","binary_version":"3.29-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77205.json"}},{"package":{"name":"libreswan","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libreswan?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.32-3ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"libreswan","binary_version":"3.32-3ubuntu3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77205.json"}},{"package":{"name":"libreswan","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libreswan?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11-1ubuntu1","4.12-1ubuntu1","4.14-1ubuntu1","4.14-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libreswan","binary_version":"4.14-1ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77205.json"}},{"package":{"name":"libreswan","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/libreswan?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2-2.2ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_version":"5.2-2.2ubuntu2","binary_name":"libreswan"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77205.json"}},{"package":{"name":"libreswan","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libreswan?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.2-2.2ubuntu1","5.2-2.2ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"libreswan","binary_version":"5.2-2.2ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77205.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}