CVE-2025-6069— HTMLParser quadratic complexity when processing malformed inputs
Quick assessment
Affected
Python Software Foundation CPython
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.
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python存在安全漏洞，该漏洞源于处理特制畸形输入时存在二次复杂度问题，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 6
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Python Software Foundation | CPython | < 3.9.24 |
affected |
3.10.0< 3.10.19 |
affected | ||
3.11.0< 3.11.14 |
affected | ||
3.12.0< 3.12.12 |
affected | ||
3.13.0< 3.13.6 |
affected | ||
3.14.0a1< 3.14.0b3 |
affected |
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I. Basic Information for CVE-2025-6069
Vulnerability Information
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Vulnerability Title
HTMLParser quadratic complexity when processing malformed inputs
Source: CVE Program / CVE List V5
Vulnerability Description
The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Python 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python存在安全漏洞，该漏洞源于处理特制畸形输入时存在二次复杂度问题，可能导致拒绝服务攻击。
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 |
|---|---|---|---|---|
| Python Software Foundation | CPython | 0 ~ 3.9.24 | - |
|
II. Public POCs for CVE-2025-6069
| # | POC Description | Source Link | Shenlong Link |
|---|
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V. Comments for CVE-2025-6069
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