---
id: CVE-2026-0989
title: >-
  A flaw was identified in the RelaxNG parser of libxml2 related to how external
  schema inclusions are handled
summary: >-
  A flaw was identified in the RelaxNG parser of libxml2 related to how external
  schema inclusions are handled. The parser does not enforce a limit on
  inclusion depth when resolving nested <include> directives. Specially crafted
  or overly …
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-674
published: '2026-01-15'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-0989'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:7519'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-0989'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2429933'
    label: secalert@redhat.com
  - url: 'https://gitlab.gnome.org/GNOME/libxml2/-/issues/998'
    label: secalert@redhat.com
tags:
  - nvd
epss: 0.00538
epssPercentile: 0.42835
ingestedAt: '2026-06-29T21:48:47.222Z'
---

## Overview

A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are handled. The parser does not enforce a limit on inclusion depth when resolving nested <include> directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk.

## Remediation

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