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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
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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/source-package/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/

Mailing list: debian-security-announce@lists.debian.org