Unrated severityNVD Advisory· Published Mar 16, 2026· Updated Apr 7, 2026
Incomplete control character validation in http.cookies
CVE-2026-3644
Description
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().
Affected products
1- Range: 0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
6- github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4mitrepatch
- github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590ddmitrepatch
- github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979ddmitrepatch
- github.com/python/cpython/pull/145600mitrepatch
- mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/mitrevendor-advisory
- github.com/python/cpython/issues/145599mitreissue-tracking
News mentions
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