---
id: CVE-2026-0990
title: 'A flaw was found in libxml2, an XML parsing library'
summary: >-
  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 cou…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-674
published: '2026-01-15'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-0990'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:7519'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-0990'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2429959'
    label: secalert@redhat.com
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/issues/1018'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00969
epssPercentile: 0.60228
ingestedAt: '2026-06-29T21:48:47.224Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.