CVE-2026-0990 MEDIUM

CVE-2026-0990: Libxml2: libxml2: denial of service via uncontrolled recursion in xml catalog processing

Vendor Red Hat
Product Red Hat Enterprise Linux 10
Weakness CWE-674
Published January 15, 2026
Last update April 22, 2026

CVSS base score

5.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 15, 2026 CVE published
April 22, 2026 Record updated