Published Jun 23, 2025Sources checked Nov 11, 2026
3.3LOWCVSS out of 10
What this means
Review the available evidence
CVE-2025-6497 and is rated Low severity with a CVSS score of 3.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Microsoft Security Response Center guidance
Vendor revision: Sep 25, 2026
Release Notes
CISA KEVNot listedBased on the latest collected catalog
EPSS0.2%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2025-6497?
A vulnerability was found in HTACG tidy-html5 5.8.0. It has been rated as problematic.
This issue affects the function prvTidyParseNamespace of the file src/parser.c. The manipulation leads to reachable assertion.
Attacking locally is a requirement. The exploit has been disclosed to the public and may be used.