CVE-2026-76781

MEDIUMCVSS 5.5

Description

A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).

Timeline

Published:September 17th, 2026 4:17 PM

Last modified:November 6th, 2026 1:17 AM

CVSS Scoring

CVSS v3: 5.5 (MEDIUM)

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-476

References & Reports

Advisories, patches, and third-party reports

https://access.redhat.com/errata/RHSA-2026:57604
https://access.redhat.com/security/cve/CVE-2026-76781
https://bugzilla.redhat.com/show_bug.cgi?id=2519776
https://gitlab.gnome.org/GNOME/libxml2/-/commit/c6324894
https://gitlab.gnome.org/GNOME/libxml2/-/merge_requests/442

Source: NIST NVD · Data may lag official sources by up to one minute