CVE-2026-6732: IBM Aix

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

A flaw was found in libxml2. This vulnerability occurs when the library processes a specially crafted XML Schema Definition (XSD) validated document that includes an internal entity reference. An attacker could exploit this by providing a malicious document, leading to a type confusion error that causes the application to crash. This results in a denial of service (DoS), making the affected system or application unavailable.

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: from 2.13.0, before 2.15.3 (fixed in 2.15.3)

Published 2026-04-23. Last modified 2026-08-31.