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.
Advisories

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Fixes

Solution

No solution given by the vendor.


Workaround

To mitigate this issue, restrict applications using libxml2 from processing untrusted RelaxNG schema files. Implement strict input validation and sanitization for all RelaxNG schema inputs to prevent the parsing of maliciously crafted, deeply nested include directives.

History

Fri, 16 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Thu, 15 Jan 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 15 Jan 2026 14:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Libxml2: unbounded relaxng include recursion leading to stack overflow
First Time appeared Redhat
Redhat enterprise Linux
Redhat jboss Core Services
Redhat openshift
Weaknesses CWE-674
CPEs cpe:/a:redhat:jboss_core_services:1
cpe:/a:redhat:openshift:4
cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
Redhat jboss Core Services
Redhat openshift
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-01-15T16:39:34.311Z

Reserved: 2026-01-15T12:38:51.419Z

Link: CVE-2026-0989

cve-icon Vulnrichment

Updated: 2026-01-15T16:39:30.668Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-01-15T15:15:52.350

Modified: 2026-01-16T15:55:33.063

Link: CVE-2026-0989

cve-icon Redhat

Severity : Low

Publid Date: 2026-01-15T00:00:00Z

Links: CVE-2026-0989 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses