high7.5
CVE-2026-3644
The fix for CVE-2026-0672, which rejected control characters in http.cookies.Morsel, was incomplete.
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Python | Python | before 3.13.13 from 3.14.0 before 3.14.4 Version 3.15.0 |
Weakness classification
References
- NVD record
- CVE.org record
- https://github.com/python/cpython/commit/3974092b037f9a3b000fb15b48ea61ce3b25d330
- https://github.com/python/cpython/commit/556aa098e738b127c714866f819b4abe2f7593d8
- https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4
- https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd
- https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd
- https://github.com/python/cpython/commit/dae4b1a21f8df4570e30986affd61bbe4ade4cef
- https://github.com/python/cpython/issues/145599
- https://github.com/python/cpython/pull/145600
- https://mail.python.org/archives/list/security-announce@python.org/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/