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CVE-2025-6496— HTACG tidy-html5 parser.c InsertNodeAsParent null pointer dereference

Quick assessment

Affected
HTACG tidy-html5
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.

HTACG HTML Tidy是HTML Tidy Advocacy Community Group开源的一个 HTML 工具。 HTACG HTML Tidy 5.8.0版本存在安全漏洞，该漏洞源于文件src/parser.c中函数InsertNodeAsParent存在空指针取消引用。

CVSS 3.3 · Low EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2025-6496

Vulnerability Information
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Vulnerability Title
HTACG tidy-html5 parser.c InsertNodeAsParent null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been declared as problematic. This vulnerability affects the function InsertNodeAsParent of the file src/parser.c. The manipulation leads to null pointer dereference. Local access is required to approach this attack. The exploit has been disclosed to the public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
HTACG HTML Tidy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HTACG HTML Tidy是HTML Tidy Advocacy Community Group开源的一个 HTML 工具。 HTACG HTML Tidy 5.8.0版本存在安全漏洞，该漏洞源于文件src/parser.c中函数InsertNodeAsParent存在空指针取消引用。
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
HTACG tidy-html5 5.8.0 -

II. Public POCs for CVE-2025-6496

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III. Intelligence Information for CVE-2025-6496

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Proof of Concept for CVE-2025-6496 (1)

Other References for CVE-2025-6496 (1)

Same Patch Batch · HTACG · 2025-06-23 · 3 CVEs total

CVE-2025-6498 3.3 LOW HTACG tidy-html5 alloc.c defaultAlloc memory leak
CVE-2025-6497 3.3 LOW HTACG tidy-html5 parser.c prvTidyParseNamespace assertion

IV. Related Vulnerabilities

Same product: tidy-html5
Same vendor: HTACG
Same weakness: CWE-476