Amazon Linux 2 (EOS) Security Advisory: ALAS2-2026-4059
Advisory Released Date: 2026-10-30
Advisory Updated Date: 2026-11-02
Severity:
Medium
Issue Overview:
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). (CVE-2026-76781)
Affected Packages:
libxml2
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update libxml2 or yum update --advisory ALAS2-2026-4059 to update your system.
New Packages:
aarch64:
libxml2-2.9.1-6.amzn2.5.28.aarch64
libxml2-devel-2.9.1-6.amzn2.5.28.aarch64
libxml2-static-2.9.1-6.amzn2.5.28.aarch64
libxml2-python-2.9.1-6.amzn2.5.28.aarch64
libxml2-debuginfo-2.9.1-6.amzn2.5.28.aarch64
i686:
libxml2-2.9.1-6.amzn2.5.28.i686
libxml2-devel-2.9.1-6.amzn2.5.28.i686
libxml2-static-2.9.1-6.amzn2.5.28.i686
libxml2-python-2.9.1-6.amzn2.5.28.i686
libxml2-debuginfo-2.9.1-6.amzn2.5.28.i686
src:
libxml2-2.9.1-6.amzn2.5.28.src
x86_64:
libxml2-2.9.1-6.amzn2.5.28.x86_64
libxml2-devel-2.9.1-6.amzn2.5.28.x86_64
libxml2-static-2.9.1-6.amzn2.5.28.x86_64
libxml2-python-2.9.1-6.amzn2.5.28.x86_64
libxml2-debuginfo-2.9.1-6.amzn2.5.28.x86_64