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CVE-2025-49794— Libxml: heap use after free (uaf) leads to denial of service (dos)

Quick assessment

Affected
CVE-2025-49794
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，该漏洞源于解析XPath元素时存在释放后重用问题，可能导致程序崩溃或未定义行为。

CVSS 9.1 · Critical EPSS 0.83% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 49

VendorProduct Version RangeStatus
None None < 2.15.0 affected
Red Hat cert-manager operator for Red Hat OpenShift 1.16 v1.16.5-1760515757< * unaffected
Red Hat OpenShift File Integrity Operator - FIO 1 v1.3< * unaffected
Red Hat Red Hat 3scale API Management Platform 2 any affected
any affected
Red Hat Red Hat Enterprise Linux 10 0:2.12.5-7.el10_0< * unaffected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.9.1-6.el7_9.10< * unaffected
Red Hat Red Hat Enterprise Linux 8 0:2.9.7-21.el8_10.1< * unaffected
0:2.9.7-21.el8_10.1< * unaffected
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:2.9.7-9.el8_2.3< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.9.7-9.el8_4.6< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.9.7-9.el8_4.6< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.9.7-13.el8_6.10< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:2.9.7-13.el8_6.10< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:2.9.7-13.el8_6.10< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.9.7-16.el8_8.9< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.9.7-16.el8_8.9< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:2.9.13-10.el9_6< * unaffected
0:2.9.13-10.el9_6< * unaffected
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.9.13-1.el9_0.5< * unaffected
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.9.13-3.el9_2.7< * unaffected
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.9.13-10.el9_4< * unaffected
Red Hat Red Hat Hardened Images 2.15.2-0.3.hum1< * unaffected
Red Hat Red Hat Insights proxy 1.5 1.5.5-1754504343< * unaffected
Red Hat Red Hat JBoss Core Services 2.4.62.SP2 any unaffected
Red Hat Red Hat OpenShift Container Platform 4.12 412.86.202510291903-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.13 413.92.202510150118-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.14 414.92.202510211419-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.15 415.92.202609140326-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202609011112-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.17 417.94.202510112152-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.18 418.94.202510230424-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.19 4.19.9.6.202510140714-0< * unaffected
Red Hat Red Hat OpenShift Container Platform 4.20 4.20.9.6.202509251656-0< * unaffected
Red Hat Red Hat Web Terminal 1.11 on RHEL 9 1.11-19< * unaffected
1.11-8< * unaffected
Red Hat Red Hat Web Terminal 1.12 on RHEL 9 1.12-4< * unaffected
Red Hat RHOSS-1.36-RHEL-8 1.36.0-11< * unaffected
1.36.0-11< * unaffected
1.36.0-11< * unaffected
1.36.0-10< * unaffected
1.36.0-10< * unaffected
1.36.0-4< * unaffected
1.36.0-9< * unaffected
1.36.0-12< * unaffected
… +3 more rows

I. Basic Information for CVE-2025-49794

Vulnerability Information
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Vulnerability Title
Libxml: heap use after free (uaf) leads to denial of service (dos)
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
无效指针解引用
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，该漏洞源于解析XPath元素时存在释放后重用问题，可能导致程序崩溃或未定义行为。
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)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 2.15.0 -
Red Hat Red Hat Enterprise Linux 10 0:2.12.5-7.el10_0 ~ * cpe:/o:redhat:enterprise_linux:10.0
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.9.1-6.el7_9.10 ~ * cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 0:2.9.7-21.el8_10.1 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8 0:2.9.7-21.el8_10.1 ~ * cpe:/a:redhat:enterprise_linux:8::appstream
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:2.9.7-9.el8_2.3 ~ * cpe:/a:redhat:rhel_aus:8.2::appstream
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.9.7-9.el8_4.6 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.9.7-9.el8_4.6 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.9.7-13.el8_6.10 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:2.9.7-13.el8_6.10 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:2.9.7-13.el8_6.10 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.9.7-16.el8_8.9 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.9.7-16.el8_8.9 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:2.9.13-10.el9_6 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:2.9.13-10.el9_6 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:2.9.13-1.el9_0.5 ~ * cpe:/a:redhat:rhel_e4s:9.0::appstream
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.9.13-3.el9_2.7 ~ * cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:2.9.13-10.el9_4 ~ * cpe:/a:redhat:rhel_eus:9.4::appstream
Red Hat Red Hat JBoss Core Services 2.4.62.SP2 - cpe:/a:redhat:jboss_core_services:1.0
Red Hat Red Hat OpenShift Container Platform 4.12 412.86.202510291903-0 ~ * cpe:/a:redhat:openshift:4.12::el8
Red Hat Red Hat OpenShift Container Platform 4.13 413.92.202510150118-0 ~ * cpe:/a:redhat:openshift:4.13::el9
Red Hat Red Hat OpenShift Container Platform 4.14 414.92.202510211419-0 ~ * cpe:/a:redhat:openshift:4.14::el9
Red Hat Red Hat OpenShift Container Platform 4.15 415.92.202609140326-0 ~ * cpe:/a:redhat:openshift:4.15::el9
Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202609011112-0 ~ * cpe:/a:redhat:openshift:4.16::el9
Red Hat Red Hat OpenShift Container Platform 4.17 417.94.202510112152-0 ~ * cpe:/a:redhat:openshift:4.17::el9
Red Hat Red Hat OpenShift Container Platform 4.18 418.94.202510230424-0 ~ * cpe:/a:redhat:openshift:4.18::el9
Red Hat Red Hat OpenShift Container Platform 4.19 4.19.9.6.202510140714-0 ~ * cpe:/a:redhat:openshift:4.19::el9
Red Hat Red Hat OpenShift Container Platform 4.20 4.20.9.6.202509251656-0 ~ * cpe:/a:redhat:openshift:4.20::el9
Red Hat Red Hat Web Terminal 1.11 on RHEL 9 1.11-19 ~ * cpe:/a:redhat:webterminal:1.11::el9
Red Hat Red Hat Web Terminal 1.11 on RHEL 9 1.11-8 ~ * cpe:/a:redhat:webterminal:1.11::el9

II. Public POCs for CVE-2025-49794

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2025-49794

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Vendor Advisories for CVE-2025-49794 (20)

IV. Related Vulnerabilities

Same weakness: CWE-825

V. Comments for CVE-2025-49794

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