Amazon Linux 2023 Security Advisory: ALAS2023-2026-1396
Advisory Released Date: 2026-02-05
Advisory Updated Date: 2026-02-05
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. (CVE-2026-0990)
A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition. (CVE-2026-0992)
Affected Packages:
libxml2
Issue Correction:
Run dnf update libxml2 --releasever 2023.10.20260202 or dnf update --advisory ALAS2023-2026-1396 --releasever 2023.10.20260202 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
aarch64:
libxml2-debuginfo-2.10.4-1.amzn2023.0.16.aarch64
libxml2-debugsource-2.10.4-1.amzn2023.0.16.aarch64
python3-libxml2-debuginfo-2.10.4-1.amzn2023.0.16.aarch64
libxml2-static-2.10.4-1.amzn2023.0.16.aarch64
libxml2-devel-2.10.4-1.amzn2023.0.16.aarch64
python3-libxml2-2.10.4-1.amzn2023.0.16.aarch64
libxml2-2.10.4-1.amzn2023.0.16.aarch64
src:
libxml2-2.10.4-1.amzn2023.0.16.src
x86_64:
libxml2-debuginfo-2.10.4-1.amzn2023.0.16.x86_64
python3-libxml2-debuginfo-2.10.4-1.amzn2023.0.16.x86_64
libxml2-debugsource-2.10.4-1.amzn2023.0.16.x86_64
libxml2-static-2.10.4-1.amzn2023.0.16.x86_64
libxml2-devel-2.10.4-1.amzn2023.0.16.x86_64
python3-libxml2-2.10.4-1.amzn2023.0.16.x86_64
libxml2-2.10.4-1.amzn2023.0.16.x86_64