{"id":"USN-8769-1","summary":"phpseclib vulnerability","details":"It was discovered that phpseclib did not perform padding validation in\nconstant time when using AES in CBC mode. A remote attacker could possibly\nuse this issue to conduct a padding oracle timing attack and obtain\nsensitive information.","modified":"2026-09-16T02:57:28.071001132Z","published":"2026-09-15T15:59:40Z","related":["UBUNTU-CVE-2023-48795","UBUNTU-CVE-2023-52892","UBUNTU-CVE-2024-27354","UBUNTU-CVE-2024-27355","UBUNTU-CVE-2026-32935"],"upstream":["CVE-2023-48795","CVE-2023-52892","CVE-2024-27354","CVE-2024-27355","CVE-2026-32935","UBUNTU-CVE-2023-48795","UBUNTU-CVE-2023-52892","UBUNTU-CVE-2024-27354","UBUNTU-CVE-2024-27355","UBUNTU-CVE-2026-32935"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8769-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-48795"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-52892"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-27354"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2024-27355"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32935"}],"affected":[{"package":{"name":"phpseclib","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.1-3ubuntu0.1+esm1"}]}],"versions":["0.3.10-3","1.0.0-2","1.0.0-3","1.0.1-1","1.0.1-3","1.0.1-3ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"php-seclib","binary_version":"1.0.1-3ubuntu0.1+esm1"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2023-52892","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2024-27354"},{"severity":[{"score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-32935"}],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8769-1.json"}},{"package":{"name":"phpseclib","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.9-1ubuntu0.1~esm2"}]}],"versions":["1.0.7-1","1.0.8-1","1.0.9-1","1.0.9-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.9-1ubuntu0.1~esm2","binary_name":"php-seclib"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-32935"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8769-1.json"}},{"package":{"name":"phpseclib","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.18-2ubuntu0.1~esm2"}]}],"versions":["1.0.16-2","1.0.18-2","1.0.18-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.18-2ubuntu0.1~esm2","binary_name":"php-seclib"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8769-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-32935"}]}}},{"package":{"name":"phpseclib","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/phpseclib?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.20-1+deb12u3build0.22.04.1"}]}],"versions":["1.0.19-3ubuntu2","1.0.19-3ubuntu3","1.0.20-1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.0.20-1+deb12u3build0.22.04.1","binary_name":"php-seclib"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8769-1.json","cves_map":{"ecosystem":"Ubuntu:22.04:LTS","cves":[{"id":"CVE-2023-52892","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2024-27354","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2024-27355"},{"id":"CVE-2026-32935","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"phpseclib","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.23-1ubuntu0.1~esm1"}]}],"versions":["1.0.21-2","1.0.22-1","1.0.23-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"1.0.23-1ubuntu0.1~esm1","binary_name":"php-seclib"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-32935","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:24.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8769-1.json"}},{"package":{"name":"phpseclib","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/phpseclib?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.24-1ubuntu0.1~esm1"}]}],"versions":["1.0.23-6","1.0.24-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"1.0.24-1ubuntu0.1~esm1","binary_name":"php-seclib"}]},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-32935","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"},{"score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:26.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8769-1.json"}}],"schema_version":"1.9.0"}