Quadratic complexity parsing cookies with backslashes
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 2.3%
exploitation probability
2.3%top 18% of all CVEs
observed exploitation
nono source reports it
There is a LOW severity vulnerability affecting CPython, specifically the
'http.cookies' standard library module.
When parsing cookies that contained backslashes for quoted characters in
the cookie value, the parser would use an algorithm with quadratic
complexity, resulting in excess CPU resources being used while parsing the
value.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Python Software Foundation · CPythonReferences
https://github.com/python/cpython/commit/391e5626e3ee5af267b97e37abc7475732e67621https://github.com/python/cpython/commit/44e458357fca05ca0ae2658d62c8c595b048b5efhttps://github.com/python/cpython/commit/a77ab24427a18bff817025adb03ca920dc3f1a06https://github.com/python/cpython/commit/b2f11ca7667e4d57c71c1c88b255115f16042d9ahttps://github.com/python/cpython/commit/d4ac921a4b081f7f996a5d2b101684b67ba0ed7fhttps://github.com/python/cpython/commit/d662e2db2605515a767f88ad48096b8ac623c774https://github.com/python/cpython/commit/dcc3eaef98cd94d6cb6cb0f44bd1c903d04f33b1https://github.com/python/cpython/issues/123067https://github.com/python/cpython/pull/123075https://lists.debian.org/debian-lts-announce/2024/12/msg00000.htmlhttps://mail.python.org/archives/list/security-announce@python.org/thread/HXJAAAALNUNGCQUS2W7WR6GFIZIHFOOK/https://security.netapp.com/advisory/ntap-20241018-0006/