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CVE-2026-6653— libxml2: Use after free in xmlParseInternalSubset via improper entity resolution handling

Quick assessment

Affected
GNOME libxml2
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.

GNOME libxml2是GNOME基金会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。 GNOME libxml2 2.9.11至2.11.0版本存在安全漏洞，该漏洞源于xmlParseInternalSubset函数中存在释放后重用问题，可能导致远程攻击者通过特制的XML输入造成拒绝服务。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.36% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNOME libxml2 2.9.11< 2.11.0 affected
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I. Basic Information for CVE-2026-6653

Vulnerability Information
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Vulnerability Title
libxml2: Use after free in xmlParseInternalSubset via improper entity resolution handling
Source: CVE Program / CVE List V5
Vulnerability Description
Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
GNOME libxml2 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNOME libxml2是GNOME基金会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。 GNOME libxml2 2.9.11至2.11.0版本存在安全漏洞，该漏洞源于xmlParseInternalSubset函数中存在释放后重用问题，可能导致远程攻击者通过特制的XML输入造成拒绝服务。
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
GNOME libxml2 2.9.11 ~ 2.11.0 -

II. Public POCs for CVE-2026-6653

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III. Intelligence Information for CVE-2026-6653

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Vendor Advisories for CVE-2026-6653 (1)

Other References for CVE-2026-6653 (1)

IV. Related Vulnerabilities

Same product: libxml2
Same vendor: GNOME
Same weakness: CWE-416

V. Comments for CVE-2026-6653

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