phpseclib/phpseclib · Security
phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack
- GHSA ID
- GHSA-94g3-g5v7-q4jg
- CVE ID
- CVE-2026-32935
- Severity
- high
- Published
- Updated
- CVSS v4
- 8.2 · 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
Description
Impact
Those using AES in CBC mode may be susceptible to a padding oracle timing attack.
Patches
https://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788
Workarounds
Use AES in CTR, CFB or OFB modes
References
https://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788
CWEs
- CWE-208 · Observable Timing Discrepancy