CVE-2026-0990: Libxml2: libxml2: denial of service via uncontrolled recursion in xml catalog processing
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-0990?
The severity of CVE-2026-0990 has been rated as high due to its potential to cause denial of service.
How do I fix CVE-2026-0990?
To fix CVE-2026-0990, update to the latest version of libxml2 that addresses this vulnerability.
What causes CVE-2026-0990?
CVE-2026-0990 is caused by uncontrolled recursion in the xmlCatalogXMLResolveURI function during XML catalog processing.
Who is affected by CVE-2026-0990?
All users of libxml2 that handle XML catalogs with delegate URI entries may be affected by CVE-2026-0990.
How can I test for CVE-2026-0990?
You can test for CVE-2026-0990 by attempting to process an XML catalog that includes recursive delegate URI entries and observing for any denial of service conditions.