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CVE-2026-0989

Libxml2: unbounded relaxng include recursion leading to stack overflow

Published: Jan 15, 2026Updated: Apr 22, 2026 Sources: CVE List NVD BDUCWE-674
NVD MITRE
3.7CVSSLOW
EPSS Score
0.4%
Top 69.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-674

Affected Products

Astra Linux Special EditionООО «РусБИТех-Астра»
On-premOS
Operating Systems / linux-distro
Альт 8 СПАО «ИВК»
On-premOS
Operating Systems / linux-distro
libxml2Сообщество свободного программного обеспечения
LibraryLibrary
OSS Libraries / generic-library
АЛЬТ СП 10АО «ИВК»
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
ооо «русбитех-астра»commercialRUOperating Systemsaka rusbitech-astra
ао «ивк»commercialRUOperating Systemsaka ivk
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ооо «ред софт»commercialRUOperating Systemsaka red soft
and 9 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:7519
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-0989
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2429933
bugzilla.redhat.com
and 8 more references View all →

Timeline

Published
Jan 15, 2026
Last Updated
Apr 22, 2026

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