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CVE-2026-3644

Incomplete control character validation in http.cookies

CVSS 6 MEDIUMEPSS 0.4%CWE-116CWE-20
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete. The Morsel.update(), |= operator, and unpickling paths were not patched, allowing control characters to bypass input validation. Additionally, BaseCookie.js_output() lacked the output validation applied to BaseCookie.output().
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Produtos afetados
Python Software Foundation · CPython

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Referências
https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590ddhttps://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979ddhttps://github.com/python/cpython/issues/145599https://github.com/python/cpython/pull/145600https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/