Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Hardened Images | - |
| Redhat | Jboss Core Services | - |
| Redhat | Openshift Container Platform | 4.0 |
| Redhat | Enterprise Linux | 6.0 |
| Ibm | Vios | >= 4.1.0, < 4.1.1.30 |
| Ibm | Aix | >= 7.2.5, < 7.2.5.12 |
| Xmlsoft | Libxml2 | < 2.15.2 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/errata/RHSA-2026:7519Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2026-0990Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2429959Issue TrackingThird Party Advisory
- https://gitlab.gnome.org/GNOME/libxml2/-/issues/1018ExploitIssue TrackingThird Party Advisory
FAQ
What is CVE-2026-0990?
CVE-2026-0990 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ref...
How severe is CVE-2026-0990?
CVE-2026-0990 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-0990?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Hardened Images, Redhat Jboss Core Services, Redhat Openshift Container Platform, Redhat Enterprise Linux, Ibm Vios.