CVE-2025-6069 Details
Description
The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
A denial-of-service vulnerability has been identified in the Python HTML parser's HTMLParser class, specifically in versions 3.9 through 3.14. This vulnerability arises from a worst-case quadratic complexity when the parser processes certain crafted malformed inputs. Such complexity can be exploited to amplify denial-of-service conditions, causing the parser to slow down significantly under specific scenarios.
Users can upgrade to Python versions 3.15 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 17, 2025CISA-ADP
Assessed Jun 17, 2025References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1333 | Inefficient Regular Expression Complexity | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Python html.parser.HTMLParser | All versions |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 31, 2026 | CVE Modified | [email protected] |
| Jul 30, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jul 7, 2025 | CVE Modified | [email protected] |
| Jun 17, 2025 | New CVE Received | [email protected] |