CVE-2026-3644

N/A

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().

CVE Details

CVSS v3.1 ScoreN/A

Published3/16/2026

Last Modified3/17/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-20CWE-116

References

https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4(cna@python.org)

https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd(cna@python.org)

https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd(cna@python.org)

https://github.com/python/cpython/issues/145599(cna@python.org)

https://github.com/python/cpython/pull/145600(cna@python.org)

https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/(cna@python.org)

IOC Correlations

No correlations recorded

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