Moole Vulnerability Database

Find real vulnerabilities before they ship

Medium

CVE-2025-6069

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

VectorNETWORK

PublishedJun 17, 2025, 14:15

Published Bycna@python.org

Base Score

Score4.3

Affected Versions

No affected versions found.

References

https://github.com/python/cpython/commit/4455cbabf991e202185a25a631af206f60bbc949
https://github.com/python/cpython/commit/6eb6c5dbfb528bd07d77b60fd71fd05d81d45c41
https://github.com/python/cpython/commit/8d1b3dfa09135affbbf27fb8babcf3c11415df49
https://github.com/python/cpython/commit/ab0893fd5c579d9cea30841680e6d35fc478afb5
https://github.com/python/cpython/commit/d851f8e258c7328814943e923a7df81bca15df4b
https://github.com/python/cpython/commit/f3c6f882cddc8dc30320d2e73edf019e201394fc
https://github.com/python/cpython/commit/fdc9d214c01cb4588f540cfa03726bbf2a33fc15
https://github.com/python/cpython/issues/135462
https://github.com/python/cpython/pull/135464
https://mail.python.org/archives/list/security-announce@python.org/thread/K5PIYLR6EP3WR7ZOKKYQUWEDNQVUXOYM/

Weakness Type

CWE-1333

CVSS Metrics

Base Score

4.3

Vector String

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Base SeverityMedium

Version

3.1

Attack Vector (AV)

NETWORK