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Vulnerability record · CVE-2026-0989 · published 15 January 2026

CVE-2026-0989: Xmlsoft libxml2 vulnerability

Xmlsoft · Libxml2

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.

3.7 CVSS 3.1 Low EPSS 0.54% · top 57.0% CWE-674 · CWE-674
3.7CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
7Affected product versions listed by NVD
4References, 1 tagged exploit
1 Sep 2026Last modified by NVD

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.

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

Affected products

7 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:7519 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-0989 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2429933 Issue TrackingThird Party Advisory
https://gitlab.gnome.org/GNOME/libxml2/-/issues/998 ExploitIssue TrackingMitigationThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-0989), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.