CVE-2026-0990: IBM Aix

Medium severity, CVSS 5.9. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• IBM Aix: from 7.2.5, before 7.2.5.12 (fixed in 7.2.5.12); from 7.3.2, before 7.3.3.3 (fixed in 7.3.3.3); version 7.3.4 only
• IBM Vios: from 4.1.0, before 4.1.1.30 (fixed in 4.1.1.30); version 4.1.2.0 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only
• Red Hat Hardened Images: affected versions not specified
• Red Hat JBoss Core Services: affected versions not specified
• Red Hat Openshift Container Platform: version 4.0 only
• Xmlsoft LIBXML2: before 2.15.2 (fixed in 2.15.2)

Published 2026-01-15. Last modified 2026-09-01.