Vulnerability in IBM Aix
CVE-2026-0989
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.
EPSS: 0.004 (35.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
Affected products
- Ibm Aix — versions 7.3.4
- Ibm Vios — versions 4.1.2.0
- Xmlsoft Libxml2
- 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 Hardened Images — versions 2.15.2-0.3.hum1
- Red Hat Jboss Core Services
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
- secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (Exploit, Third Party Advisory, Mitigation, Issue Tracking)
Frequently asked questions
- What is CVE-2026-0989?
- CVE-2026-0989 is a low-severity vulnerability in IBM Aix, classified under Uncontrolled Recursion. CVSS score: 3.7/10. Published 2026-01-15.
- How severe is CVE-2026-0989?
- Low severity. CVSS v3 base score is 3.7 out of 10.