A libksba security update has been released for Debian GNU/Linux 11 to address an integer overflow flaw.

DSA 5255-1: libksba security update

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Debian Security Advisory DSA-5255-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
October 17, 2022   https://www.debian.org/security/faq
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Package : libksba
CVE ID : CVE-2022-3515
Debian Bug : 1021928

An integer overflow flaw was discovered in the CRL parser in libksba, an
X.509 and CMS support library, which could result in denial of service
or the execution of arbitrary code.

Details can be found in the upstream advisory at
  https://gnupg.org/blog/20221017-pepe-left-the-ksba.html

For the stable distribution (bullseye), this problem has been fixed in
version 1.5.0-3+deb11u1.

We recommend that you upgrade your libksba packages.

For the detailed security status of libksba please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/libksba

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/