CVE-2026-3644
6
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
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Python Software Foundation | CPython | 0 < 3.13.13 | affected |
| Python Software Foundation | CPython | 3.14.0 < 3.14.4 | affected |
| Python Software Foundation | CPython | 3.15.0a1 < 3.15.0a8 | affected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/
- https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4
- https://github.com/python/cpython/issues/145599
- https://github.com/python/cpython/pull/145600
- https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd
- https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd
- https://github.com/python/cpython/commit/556aa098e738b127c714866f819b4abe2f7593d8
- https://github.com/python/cpython/commit/dae4b1a21f8df4570e30986affd61bbe4ade4cef
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