CVE-2026-0989— Libxml2: unbounded relaxng include recursion leading to stack overflow
Quick assessment
Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
libxml2是GNOME开源的一个用来解析XML文档的函数库。它用C语言写成，并且能为多种语言所调用，例如C语言，C++，XSH。 libxml2存在安全漏洞，该漏洞源于RelaxNG解析器在处理外部模式包含时未对包含深度进行限制，可能导致解析特制或过于复杂的模式时造成堆栈耗尽和应用程序崩溃。
Possible ATT&CK Techniques 1 AI
T1496 · Resource HijackingAffected Version Matrix 9
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
| Red Hat | Red Hat Hardened Images | 2.15.2-0.3.hum1< * |
unaffected |
| Red Hat | Red Hat JBoss Core Services | any |
affected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
affected |
any |
affected |
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I. Basic Information for CVE-2026-0989
Vulnerability Information
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Vulnerability Title
Libxml2: unbounded relaxng include recursion leading to stack overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
libxml2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libxml2是GNOME开源的一个用来解析XML文档的函数库。它用C语言写成，并且能为多种语言所调用，例如C语言，C++，XSH。 libxml2存在安全漏洞，该漏洞源于RelaxNG解析器在处理外部模式包含时未对包含深度进行限制，可能导致解析特制或过于复杂的模式时造成堆栈耗尽和应用程序崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Hardened Images | 2.15.2-0.3.hum1 ~ * |
cpe:/a:redhat:hummingbird:1
|
|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat JBoss Core Services | - |
cpe:/a:redhat:jboss_core_services:1
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-0989
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-0989 (3)
-
-
🔗 2429933 – (CVE-2026-0989) CVE-2026-0989 libxml2: Unbounded RelaxNG Include Recursion Leading to Stack Overflow Read full article issue-tracking x_refsource_REDHAT
-
Same Patch Batch · Red Hat · 2026-01-15 · 4 CVEs total
| CVE-2026-0990 | 5.9 MEDIUM | Libxml2: libxml2: denial of service via uncontrolled recursion in xml catalog processing |
| CVE-2026-0976 | 3.7 LOW | Org.keycloak/keycloak-quarkus-server: keycloak: proxy bypass due to improper handling of m |
| CVE-2026-0992 | 2.9 LOW | Libxml2: libxml2: denial of service via crafted xml catalogs |
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V. Comments for CVE-2026-0989
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