phpseclib is a PHP secure communications library. Projects using versions 1.0.26 and below, 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.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
phpseclib phpseclib affected
Version Status Constraints
>= 3.0.0, < 3.0.50 affected
—
>= 2.0.0, < 2.0.52 affected
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< 1.0.27 affected
—

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Subscriptions

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-94g3-g5v7-q4jg phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788 cve-icon cve-icon
https://github.com/phpseclib/phpseclib/security/advisories/GHSA-94g3-g5v7-q4jg cve-icon cve-icon
History

Fri, 20 Mar 2026 03:15:00 +0000

Type Values Removed Values Added
Description phpseclib is a PHP secure communications library. Projects using versions 1.0.26 and below, 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.
Title phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack
Weaknesses CWE-208
References
Metrics cvssV4_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'}
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-20T02:48:59.778Z

Reserved: 2026-03-17T00:05:53.282Z

Link: CVE-2026-32935

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-20T03:16:00.763

Modified: 2026-03-20T03:16:00.763

Link: CVE-2026-32935

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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Weaknesses