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A phpseclib security update has been released for Debian GNU/Linux 10 LTS to address a mishandling of RSA PKCS#1 v1.5 signature verification.

DLA 3197-1: phpseclib security update

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Debian LTS Advisory DLA-3197-1 Sylvain Beucler
November 17, 2022
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Package : phpseclib
Version : 1.0.19-3~deb10u1
CVE ID : CVE-2021-30130

It was discovered that phpseclib, a pure-PHP implementation of various
cryptographic and arithmetic algorithms (v1), mishandles RSA PKCS#1
v1.5 signature verification. An attacker may get invalid signatures
accepted, bypassing authorization control in specific situations.

For Debian 10 buster, this problem has been fixed in version

We recommend that you upgrade your phpseclib packages.

For the detailed security status of phpseclib please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: