CVE-2026-32935

phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack

State: Published
Severity: 8.2 High
Published: Mar 20, 2026
Updated: May 8, 2026
Reserved: Mar 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	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	GitHub_M

Weaknesses

CWE-208 Observable Timing Discrepancy

Affected Products

Product	Versions
phpseclibphpseclib	>= 3.0.0, < 3.0.50Affected >= 2.0.0, < 2.0.52Affected >= 0.1.1, < 1.0.27Affected

References

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