CVE-2026-76781

Public on 2026-09-17
Modified on 2026-09-18
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).
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
5.5
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Core libxml2 2026-10-30 ALAS2-2026-4059 Fixed
Amazon Linux 2023 libxml2 2026-10-30 ALAS2023-2026-3341 Fixed
Amazon Linux 2027 Preview libxml2 2026-11-02 ALAS2027-2026-300 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-76781 Mitre: CVE-2026-76781