CVE-2026-0989: IBM Aix

Low severity, CVSS 3.7. EPSS: 0.5% chance of exploitation in the next 30 days.

A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are handled. The parser does not enforce a limit on inclusion depth when resolving nested <include> directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk.

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.