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CVE-2026-32935— phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack

Quick assessment

Affected
phpseclib phpseclib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

phpseclib是phpseclib开源的一个 PHP 安全通信库。 phpseclib 1.0.26及之前版本、2.0.0至2.0.51版本和3.0.0至3.0.49版本存在安全漏洞，该漏洞源于使用AES CBC模式时存在填充预言机计时攻击。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1557.002 · ARP Cache Poisoning

Affected Version Matrix 3

VendorProduct Version RangeStatus
phpseclib phpseclib >= 3.0.0, < 3.0.50 affected
>= 2.0.0, < 2.0.52 affected
>= 0.1.1, < 1.0.27 affected
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I. Basic Information for CVE-2026-32935

Vulnerability Information
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Vulnerability Title
phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过时间差异性导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
phpseclib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
phpseclib是phpseclib开源的一个 PHP 安全通信库。 phpseclib 1.0.26及之前版本、2.0.0至2.0.51版本和3.0.0至3.0.49版本存在安全漏洞，该漏洞源于使用AES CBC模式时存在填充预言机计时攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
phpseclib phpseclib >= 3.0.0, < 3.0.50 -

II. Public POCs for CVE-2026-32935

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III. Intelligence Information for CVE-2026-32935

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Patches & Fixes for CVE-2026-32935 (1)

Vendor Advisories for CVE-2026-32935 (1)

IV. Related Vulnerabilities

Same product: phpseclib
Same vendor: phpseclib
Same weakness: CWE-208

V. Comments for CVE-2026-32935

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