Description
http.cookies.Morsel.js_output() returns an inline <script> snippet and only escapes " for JavaScript string context. It does not neutralize the HTML parser-sensitive sequence </script> inside the generated script element. Mitigation base64-encodes the cookie value to disallow escaping using cookie value.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Python Software Foundation CPython
Default version status: unaffected
0 to < 3.13.14affected3.14.0a1 to < 3.14.5rc1affected3.15.0a1 to < 3.15.0b1affected
References
- https://github.com/python/cpython/pull/148848 ↗
- https://github.com/python/cpython/issues/90309 ↗
- https://mail.python.org/archives/list/security-announce@python.org/thread/IVNWGV2BBNC3RHQAFS22UP4DY56SAXX3/ ↗
- https://github.com/python/cpython/commit/76b3923d688c0efc580658476c5f525ec8735104 ↗
- https://github.com/python/cpython/commit/3c59b8b53fc75c7f9578d16fb8201ceb43e8f76c ↗
- https://github.com/python/cpython/commit/f795e042043dfe26c42e1971d4502c1cdc4c65b8 ↗