{"id":"CVE-2026-32935","aliases":["CLSA-2026-1779065206","DEBIAN-CVE-2026-32935","DLA-4518-1","DSA-6185-1","DSA-6186-1","DSA-6187-1","EUVD-2026-13507","GHSA-94g3-g5v7-q4jg","UBUNTU-CVE-2026-32935","USN-8769-1","USN-8830-1"],"status":"published","title":"phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack","description":"phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.","severity":{"version":"4.0","score":8.2,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00398,"percentile":0.34322,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-208"],"published":"2026-03-19T16:42:18Z","modified":"2026-10-28T02:30:57Z","fixes":[{"ecosystem":"Packagist","package":"phpseclib/phpseclib","fixed_in":["3.0.50","2.0.52","1.0.27"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"php-phpseclib","fixed_in":["2.0.42-1+deb12u3"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"php-phpseclib","fixed_in":["2.0.48-3+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"php-phpseclib","fixed_in":["2.0.52-1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"php-phpseclib3","fixed_in":["3.0.19-1+deb12u4"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"php-phpseclib3","fixed_in":["3.0.43-2+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"php-phpseclib3","fixed_in":["3.0.50-1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"phpseclib","fixed_in":["1.0.20-1+deb12u3"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"phpseclib","fixed_in":["1.0.23-6+deb13u1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"php-phpseclib","fixed_in":["2.0.1-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"php-phpseclib","fixed_in":["2.0.9-1ubuntu0.1~esm3"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"phpseclib","fixed_in":["1.0.9-1ubuntu0.1~esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"php-phpseclib","fixed_in":["2.0.23-2ubuntu0.1~esm3"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"phpseclib","fixed_in":["1.0.18-2ubuntu0.1~esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"phpseclib","fixed_in":["1.0.20-1+deb12u3build0.22.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:22.04:LTS","package":"php-phpseclib","fixed_in":["2.0.36-1ubuntu0.1~esm3"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:24.04:LTS","package":"php-phpseclib","fixed_in":["2.0.47-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:24.04:LTS","package":"phpseclib","fixed_in":["1.0.23-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:26.04:LTS","package":"php-phpseclib","fixed_in":["2.0.51-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:26.04:LTS","package":"phpseclib","fixed_in":["1.0.24-1ubuntu0.1~esm1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"phpseclib/phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"last_affected":"3.0.49"},{"fixed":"3.0.50"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"phpseclib/phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.0.0"},{"last_affected":"2.0.51"},{"fixed":"2.0.52"}]}]},{"source":"ghsa","ecosystem":"Packagist","package":"phpseclib/phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.1.1"},{"last_affected":"1.0.26"},{"fixed":"1.0.27"}]}]},{"source":"osv","ecosystem":"TuxCare:Packagist","package":"phpseclib/phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0.3.10"},{"fixed":"0.3.10-p1+tuxcare"}]}],"versions":["0.3.10"],"bundled":4},{"source":"osv","ecosystem":"Debian:12","package":"php-phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.42-1+deb12u3"}]}],"versions":["2.0.42-1","2.0.42-1+deb12u1","2.0.42-1+deb12u2"]},{"source":"osv","ecosystem":"Debian:13","package":"php-phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.48-3+deb13u1"}]}],"versions":["2.0.48-3"]},{"source":"osv","ecosystem":"Debian:14","package":"php-phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.52-1"}]}],"versions":["2.0.48-3","2.0.49-1","2.0.50-1","2.0.51-1"]},{"source":"osv","ecosystem":"Debian:12","package":"php-phpseclib3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.19-1+deb12u4"}]}],"versions":["3.0.19-1","3.0.19-1+deb12u1","3.0.19-1+deb12u2","3.0.19-1+deb12u3"]},{"source":"osv","ecosystem":"Debian:13","package":"php-phpseclib3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.43-2+deb13u1"}]}],"versions":["3.0.43-2"]},{"source":"osv","ecosystem":"Debian:14","package":"php-phpseclib3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.0.50-1"}]}],"versions":["3.0.43-2","3.0.44-1","3.0.44-2","3.0.45-1","3.0.46-1","3.0.46-2","3.0.47-1","3.0.48-1","3.0.49-1"]},{"source":"osv","ecosystem":"Debian:12","package":"phpseclib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.20-1+deb12u3"}]}],"versions":["1.0.20-1","1.0.20-1+deb12u1","1.0.20-1+deb12u2"]},{"source":"osv","ecosystem":"Debian:13","package":"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,"references":[{"url":"https://github.com/phpseclib/phpseclib/security/advisories/GHSA-94g3-g5v7-q4jg","tags":["x_refsource_CONFIRM","Patch","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-32935","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-94g3-g5v7-q4jg"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/32xxx/CVE-2026-32935.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-32935","tags":["advisory"]},{"url":"https://github.com/phpseclib/phpseclib","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-32935","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-32935","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8769-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8830-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2023-48795","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2023-52892","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2024-27354","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2024-27355","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-40194","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-44167","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-32935","title":"phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack","description":"phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.","status":"published","published":"2026-03-20T02:48:59.778Z","modified":"2026-05-08T15:19:11.716Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:19:57.100857Z"}],"euvd":[{"id":"EUVD-2026-13507","description":"phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.","status":"published","published":"2026-03-20T02:48:59Z","modified":"2026-05-08T15:19:11Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"}],"updated_at":"2026-11-02T19:05:14.505765Z"}],"ghsa":[{"id":"GHSA-94g3-g5v7-q4jg","title":"phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack","description":"### Impact\nThose using AES in CBC mode may be susceptible to a padding oracle timing attack.\n\n### Patches\nhttps://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788\n\n### Workarounds\nUse AES in CTR, CFB or OFB modes\n\n### References\nhttps://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788","status":"published","published":"2026-03-19T16:42:18Z","modified":"2026-05-08T15:18:14Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:40:03.762927Z"}],"nvd":[{"id":"CVE-2026-32935","description":"phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.","status":"published","published":"2026-03-20T03:16:00.763Z","modified":"2026-06-17T10:36:35.5Z","cvss":[{"version":"4.0","score":8.2,"vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T14:12:10.126802Z"}],"osv":[{"id":"CVE-2026-32935","title":"phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack","description":"phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.","status":"published","published":"2026-03-20T02:48:59.778Z","modified":"2026-11-11T10:47:29.145378864Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"}],"cwes":["CWE-208"],"updated_at":"2026-11-11T03:22:28.447808Z"},{"id":"DEBIAN-CVE-2026-32935","description":"phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.","status":"published","published":"2026-03-20T03:16:00.763Z","modified":"2026-10-01T03:03:22.243521862Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:54.587575Z"},{"id":"GHSA-94g3-g5v7-q4jg","title":"phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack","description":"### Impact\nThose using AES in CBC mode may be susceptible to a padding oracle timing attack.\n\n### Patches\nhttps://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788\n\n### Workarounds\nUse AES in CTR, CFB or OFB modes\n\n### References\nhttps://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788","status":"published","published":"2026-03-19T16:42:18Z","modified":"2026-09-10T03:50:38.415264842Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"}],"cwes":["CWE-208"],"updated_at":"2026-11-02T15:46:43.123867Z"},{"id":"UBUNTU-CVE-2026-32935","description":"phpseclib is a PHP secure communications library. Projects using versions 0.1.1 through 1.0.26, 2.0.0 through 2.0.51, and 3.0.0 through 3.0.49 are vulnerable to a to padding oracle timing attack when using AES in CBC mode. This issue has been fixed in versions 1.0.27, 2.0.52 and 3.0.50.","status":"published","published":"2026-03-20T03:16:00Z","modified":"2026-10-17T12:59:59.513118854Z","cvss":[{"version":"4.0","score":8.2,"vector":"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","level":"high"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:16.036833Z"},{"id":"CLSA-2026-1779065206","title":"TuxCare security update for phpseclib/phpseclib (4 CVEs)","description":"TuxCare rebuilt phpseclib/phpseclib to address 4 CVEs. Fixed in 0.3.10-p1+tuxcare.","status":"published","published":"2026-08-04T14:52:32Z","modified":"2026-10-15T09:47:41.999375702Z","updated_at":"2026-11-02T15:43:44.737408Z"},{"id":"DLA-4518-1","title":"phpseclib - security update","status":"published","published":"2026-03-30T00:00:00Z","modified":"2026-03-30T18:01:41.088764Z","updated_at":"2026-11-02T15:46:13.207219Z"},{"id":"DSA-6185-1","title":"phpseclib - security update","status":"published","published":"2026-03-29T00:00:00Z","modified":"2026-03-29T19:31:39.923352Z","updated_at":"2026-11-02T15:46:18.296714Z"},{"id":"DSA-6186-1","title":"php-phpseclib - security update","status":"published","published":"2026-03-29T00:00:00Z","modified":"2026-03-29T19:31:39.090663Z","updated_at":"2026-11-02T15:46:18.296714Z"},{"id":"DSA-6187-1","title":"php-phpseclib3 - security update","status":"published","published":"2026-03-29T00:00:00Z","modified":"2026-03-29T19:31:39.808682Z","updated_at":"2026-11-02T15:46:18.296714Z"},{"id":"USN-8769-1","title":"phpseclib vulnerability","description":"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.","status":"published","published":"2026-09-15T15:59:40Z","modified":"2026-09-16T02:57:28.071001132Z","updated_at":"2026-11-02T16:58:26.907654Z"},{"id":"USN-8830-1","title":"php-phpseclib vulnerabilities","description":"It was discovered that phpseclib did not perform constant-time padding\nvalidation when using AES in CBC mode. A remote attacker could possibly\nuse this issue to obtain sensitive information. (CVE-2026-32935)\n\nIt was discovered that phpseclib did not use a constant-time comparison\nwhen validating SSH packet authentication codes. A remote attacker could\npossibly use this issue to obtain sensitive information. (CVE-2026-40194)\n\nIt was discovered that phpseclib did not properly limit object identifier\nlengths when parsing ASN.1 data. An attacker could possibly use this issue\nto cause phpseclib to use excessive resources, leading to a denial of\nservice. (CVE-2026-44167)","status":"published","published":"2026-09-28T13:56:03Z","modified":"2026-09-28T22:57:39.805761921Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}