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CVE-2026-0990— Libxml2: libxml2: denial of service via uncontrolled recursion in xml catalog processing

CVSS 5.9 · Medium EPSS 0.06% · P19
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I. Basic Information for CVE-2026-0990

Vulnerability Information
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Vulnerability Title
Libxml2: libxml2: denial of service via uncontrolled recursion in xml catalog processing
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references itself. A remote attacker could exploit this configuration-dependent issue by providing a specially crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a segmentation fault, causing a Denial of Service (DoS) by crashing affected applications.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未经控制的递归
Source: NVD (National Vulnerability Database)
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xmlCatalogXMLResolveURI函数在XML目录包含引用自身的委托URI条目时出现不受控制的递归，可能导致远程攻击者通过特制XML目录造成无限递归和调用堆栈耗尽，引发分段违规。
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

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Hardened Images 2.15.2-0.3.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red HatRed Hat Enterprise Linux 10-cpe:/o:redhat:enterprise_linux:10
Red HatRed Hat Enterprise Linux 6-cpe:/o:redhat:enterprise_linux:6
Red HatRed Hat Enterprise Linux 7-cpe:/o:redhat:enterprise_linux:7
Red HatRed Hat Enterprise Linux 8-cpe:/o:redhat:enterprise_linux:8
Red HatRed Hat Enterprise Linux 9-cpe:/o:redhat:enterprise_linux:9
Red HatRed Hat JBoss Core Services-cpe:/a:redhat:jboss_core_services:1
Red HatRed Hat OpenShift Container Platform 4-cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-0990

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III. Intelligence Information for CVE-2026-0990

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Same Patch Batch · Red Hat · 2026-01-15 · 4 CVEs total

CVE-2026-09763.7 LOWOrg.keycloak/keycloak-quarkus-server: keycloak: proxy bypass due to improper handling of m
CVE-2026-09893.7 LOWLibxml2: unbounded relaxng include recursion leading to stack overflow
CVE-2026-09922.9 LOWLibxml2: libxml2: denial of service via crafted xml catalogs

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-674

V. Comments for CVE-2026-0990

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