[xml/sgml-pkgs] Bug#1125695: libxml2: CVE-2026-0990: Infinite recursion in xmlCatalogXMLResolveURI

[Salvatore Bonaccorso]

Source: libxml2.9
Version: 2.15.1+dfsg-2
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libxml2/-/issues/1018
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libxml2.

CVE-2026-0990[0]:
| A flaw was found in libxml2, an XML parsing library. This
| uncontrolled recursion vulnerability occurs in the
| xmlCatalogXMLResolveURI function when an XML catalog contains a
| delegate URI entry that references itself. A remote attacker could
| exploit this configuration-dependent issue by providing a specially
| crafted XML catalog, leading to infinite recursion and call stack
| exhaustion. This ultimately results in a segmentation fault, causing
| a Denial of Service (DoS) by crashing affected applications.


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-2026-0990
    https://www.cve.org/CVERecord?id=CVE-2026-0990
[1] https://gitlab.gnome.org/GNOME/libxml2/-/issues/1018

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore