CVE-2026-0992— Libxml2: libxml2: denial of service via crafted xml catalogs
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I. Basic Information for CVE-2026-0992
Vulnerability Information
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Vulnerability Title
Libxml2: libxml2: denial of service via crafted xml catalogs
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
libxml2 资源管理错误漏洞
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存在资源管理错误漏洞，该漏洞源于处理包含重复指向相同下游目录的<nextCatalog>元素的XML目录时出现不受控制的资源消耗，可能导致远程攻击者通过提供特制目录造成过度CPU消耗和应用程序可用性降低。
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 |
II. Public POCs for CVE-2026-0992
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|---|
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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-2026-0989 | 3.7 LOW | Libxml2: unbounded relaxng include recursion leading to stack overflow |
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Same product: Red Hat Hardened Images
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V. Comments for CVE-2026-0992
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