[xml/sgml-pkgs] Bug#1107720: libxml2: CVE-2025-6021

[Salvatore Bonaccorso]

Source: libxml2.9
Version: 2.12.7+dfsg+really2.9.14-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libxml2/-/issues/926
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>
Control: found -1 2.9.14+dfsg-1.3~deb12u1

Hi,

The following vulnerability was published for libxml2.

CVE-2025-6021[0]:
| A flaw was found in libxml2's xmlBuildQName function, where integer
| overflows in buffer size calculations can lead to a stack-based
| buffer overflow. This issue can result in memory corruption or a
| denial of service when processing crafted input.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2025-6021
    https://www.cve.org/CVERecord?id=CVE-2025-6021
[1] https://gitlab.gnome.org/GNOME/libxml2/-/issues/926
[2] https://gitlab.gnome.org/GNOME/libxml2/-/commit/ad346c9a249c4b380bf73c460ad3e81135c5d781

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore