CVE-2025-6069CWE-1333

CVE-2025-6069

Medium · published June 17, 2025

CVSS v3.1
4.3
EPSS
1%
Percentile
48.2
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00603 · 48.2th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2025-06-17T18:15Z
References (10)
https://github.com/python/cpython/commit/4455cbabf991e202185a25a631af206f60bbc949 · [email protected]https://github.com/python/cpython/commit/6eb6c5dbfb528bd07d77b60fd71fd05d81d45c41 · [email protected]https://github.com/python/cpython/commit/8d1b3dfa09135affbbf27fb8babcf3c11415df49 · [email protected]https://github.com/python/cpython/commit/ab0893fd5c579d9cea30841680e6d35fc478afb5 · [email protected]https://github.com/python/cpython/commit/d851f8e258c7328814943e923a7df81bca15df4b · [email protected]https://github.com/python/cpython/commit/f3c6f882cddc8dc30320d2e73edf019e201394fc · [email protected]https://github.com/python/cpython/commit/fdc9d214c01cb4588f540cfa03726bbf2a33fc15 · [email protected]https://github.com/python/cpython/issues/135462 · [email protected]https://github.com/python/cpython/pull/135464 · [email protected]https://mail.python.org/archives/list/[email protected]/thread/K5PIYLR6EP3WR7ZOKKYQUWEDNQVUXOYM/ · [email protected]
EPSS history
Timeline
  • 17 JUN 13:39Z
    HTMLParser quadratic complexity when processing malformed inputs
    cvelistv5