Information Exposure Through Timing Discrepancy in phpseclib - CVE-2026-32935
Published: April 10, 2026
Vulnerability identifier: #VU125779
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-32935
CWE-ID: CWE-208
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to observable timing discrepancy in AES-CBC unpadding when processing ciphertext in CBC mode. A remote attacker can send specially crafted ciphertext and measure response timing to disclose sensitive information.
Affected software
phpseclib
Fedora
php-phpseclib3
nextcloud
Fedora
php-phpseclib3
nextcloud
How to mitigate CVE-2026-32935
Install security update from vendor's website.
phpseclib - addressed in versions 1.0.27, 2.0.52, 3.0.50
php-phpseclib3 - addressed in versions 3.0.50-1.fc42, 3.0.50-1.fc43
nextcloud - addressed in versions 33.0.1-1.el10_1, 33.0.1-1.fc42
php-phpseclib3 - addressed in versions 3.0.50-1.fc42, 3.0.50-1.fc43
nextcloud - addressed in versions 33.0.1-1.el10_1, 33.0.1-1.fc42