Vulnerability 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().
Related Weaknesses (CWE)
References
- https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b
- https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590d
- https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979d
- https://github.com/python/cpython/issues/145599
- https://github.com/python/cpython/pull/145600
- https://mail.python.org/archives/list/[email protected]/thread/H6CADM
FAQ
What is CVE-2026-3644?
CVE-2026-3644 is a documented vulnerability. 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 character...
How severe is CVE-2026-3644?
CVSS scoring is not yet available for CVE-2026-3644. Check NVD for updates.
Is there a patch for CVE-2026-3644?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.