Affected: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Core Services, Red Hat OpenShift Container Platform 4

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.

Affected: Ubuntu:Pro:14.04:LTS: libxml2, Ubuntu:Pro:16.04:LTS: libxml2, Ubuntu:Pro:18.04:LTS: libxml2, Ubuntu:Pro:20.04:LTS: libxml2, Ubuntu:22.04:LTS: libxml2, Ubuntu:24.04:LTS: libxml2, Ubuntu:25.10: libxml2

It was discovered that libxml2 incorrectly handled maliciously crafted SGML catalog files. An attacker could possibly use this issue to cause libxml2 to consume excessive resources, leading to a denial of service. (CVE-2025-8732)

It was discovered that libxml2 incorrectly handled recursive include directories with the RelaxNG parser. An attacker could possibly use this issue to cause libxml2 to consume excessive resources, leading to a denial of service. (CVE-2026-0989)

Nick Wellnhofer discovered that libxml2 incorrectly parsed catalogs with self-referencing URI delegates. An attacker could possibly use this issue to cause libxml2 to consume excessive resources, leading to a denial of service. (CVE-2026-0990)

Nick Wellnhofer discovered that libxml2 inefficiently parsed catalogs linked with repeating nextCatalog elements. An attacker could possibly use this issue to cause libxml2 to use excessive resources, leading to a denial of service. (CVE-2026-0992)