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CVE-2025-6069

Good to know:

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Date: June 17, 2025

The html.parser.HTMLParser class had worse-case quadratic complexity when processing certain crafted malformed inputs potentially leading to amplified denial-of-service.

Severity Score

Related Resources (13)

https://github.com/python/cpython/commit/8d1b3dfa09135affbbf27fb8babcf3c11415df49
https://github.com/python/cpython/issues/135462
https://github.com/python/cpython/commit/6eb6c5dbfb528bd07d77b60fd71fd05d81d45c41
https://security-tracker.debian.org/tracker/CVE-2025-6069
https://nvd.nist.gov/vuln/detail/CVE-2025-6069
https://github.com/python/cpython/commit/ab0893fd5c579d9cea30841680e6d35fc478afb5
https://mail.python.org/archives/list/security-announce@python.org/thread/K5PIYLR6EP3WR7ZOKKYQUWEDNQVUXOYM/
https://github.com/python/cpython/commit/fdc9d214c01cb4588f540cfa03726bbf2a33fc15
https://github.com/python/cpython/commit/4455cbabf991e202185a25a631af206f60bbc949
https://github.com/python/cpython/commit/f3c6f882cddc8dc30320d2e73edf019e201394fc
https://github.com/python/cpython/commit/d851f8e258c7328814943e923a7df81bca15df4b
https://github.com/python/cpython/pull/135464
https://www.mend.io/vulnerability-database/CVE-2025-6069

Severity Score

Weakness Type (CWE)

Inefficient Regular Expression Complexity

CWE-1333

Top Fix

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Upgrade Version

Upgrade to version https://github.com/python/cpython.git - no_fix

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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