Reachable Assertion Vulnerability in HTACG Tidy-HTML5 Product
CVE-2025-6497

4.8MEDIUM

Key Information:

Vendor

Htacg

Status
Tidy-html5
Vendor
CVE Published:
23 June 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2025-6497?

The HTACG tidy-html5 version 5.8.0 contains a vulnerability within the prvTidyParseNamespace function located in src/parser.c. This flaw allows for a reachable assertion, which can potentially be exploited if an attacker has local access. The exploit has been publicly disclosed, indicating that it may be leveraged by malicious individuals. Prompt attention to this issue is essential for maintaining application security.

Affected Version(s)

tidy-html5 5.8.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-6497 - Proof of Concept

References

https://vuldb.com/?id.313613
vdb-entrytechnical-description
https://vuldb.com/?ctiid.313613
signaturepermissions-required
https://vuldb.com/?submit.601008
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

JJLeo (VulDB User)
.
CVE-2025-6497 : Reachable Assertion Vulnerability in HTACG Tidy-HTML5 Product