CVE-2025-6069

Description

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

Reserved 2025-06-13 | Published 2025-06-17 | Updated 2025-06-17 | Assigner PSF

Problem types

CWE-1333 Inefficient Regular Expression Complexity

Product status

Default status
unaffected

Any version before 3.14.0
affected

Credits

Serhiy Storchaka remediation developer

Jake Howard reporter

sw0rd1ight finder

References

github.com/python/cpython/issues/135462 issue-tracking

github.com/python/cpython/pull/135464 patch

github.com/...ommit/4455cbabf991e202185a25a631af206f60bbc949 patch

github.com/...ommit/6eb6c5dbfb528bd07d77b60fd71fd05d81d45c41 patch

github.com/...ommit/d851f8e258c7328814943e923a7df81bca15df4b patch

mail.python.org/.../thread/K5PIYLR6EP3WR7ZOKKYQUWEDNQVUXOYM/ vendor-advisory

cve.org (CVE-2025-6069)

nvd.nist.gov (CVE-2025-6069)

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