Uncontrolled Recursion Vulnerability in libxml2 XML Parsing Library
CVE-2026-0990

5.9MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
15 January 2026

What is CVE-2026-0990?

A flaw in the libxml2 XML parsing library leads to an uncontrolled recursion vulnerability due to recursive references within an XML catalog. Attackers can exploit this by crafting a specific XML catalog that points to itself, resulting in infinite recursion. This can exhaust the call stack and cause a segmentation fault, leading to a Denial of Service (DoS) situation by crashing the affected applications.

References

https://access.redhat.com/security/cve/CVE-2026-0990
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2429959
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Nick Wellnhofer for reporting this issue.
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