A libxml2 security update has been released for Debian GNU/Linux 11 to address several vulnerabilities.

DSA 5391-1: libxml2 security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-5391-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
April 20, 2023   https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : libxml2
CVE ID : CVE-2023-28484 CVE-2023-29469
Debian Bug : 1034436 1034437

Several vulnerabilities were discovered in libxml2, a library providing
support to read, modify and write XML and HTML files.

CVE-2023-28484

A NULL pointer dereference flaw when parsing invalid XML schemas may
result in denial of service.

CVE-2023-29469

It was reported that when hashing empty strings which aren't
null-terminated, xmlDictComputeFastKey could produce inconsistent
results, which may lead to various logic or memory errors.

For the stable distribution (bullseye), these problems have been fixed in
version 2.9.10+dfsg-6.7+deb11u4.

We recommend that you upgrade your libxml2 packages.

For the detailed security status of libxml2 please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/libxml2

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/