Debian 11 phpseclib TLS Confusion and Padding Oracle Attack Overview
debian lts
March 30, 2026
Two vulnerabilities were discovered in phpseclib, a PHP Secure Communications Library
Topics Covered
Summary
CVE-2023-52892
Some characters in Subject Alternative Name fields in TLS
certificates were incorrectly allowed to have a special meaning
in regular expressions, leading to name confusion in X.509
certificate host verification.
CVE-2026-32935
The AES-CBC implementation was susceptible to a padding oracle
timing attack due to the use of a short-circuiting logical
operator in the unpadding function.
For Debian 11 bullseye, these problems have been fixed in version
1.0.19-3+deb11u3.
We recommend that you upgrade your phpseclib packages.
For the detailed security status of phpseclib please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/phpseclib
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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Package: phpseclib
Version: 1.0.19-3+deb11u3
CVE ID: CVE-2023-52892 CVE-2026-32935
Topics Covered
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