CVEvulnerability
CVE-2026-3644
6.0 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2026-03-16
- Last modified
- 2026-08-13
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 6.0 MEDIUM — 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-116, CWE-20
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 configurations
• python python (< 3.13.13)
• python python (>= 3.14.0 < 3.14.4)
• python python 3.15.0
Related
References
- https://github.com/python/cpython/commit/3974092b037f9a3b000fb15b48ea61ce3b25d330 github.com
- https://github.com/python/cpython/commit/556aa098e738b127c714866f819b4abe2f7593d8 github.com
- https://github.com/python/cpython/commit/57e88c1cf95e1481b94ae57abe1010469d47a6b4 Patch
- https://github.com/python/cpython/commit/62ceb396fcbe69da1ded3702de586f4072b590dd Patch
- https://github.com/python/cpython/commit/d16ecc6c3626f0e2cc8f08c309c83934e8a979dd Patch
- https://github.com/python/cpython/commit/dae4b1a21f8df4570e30986affd61bbe4ade4cef github.com
- https://github.com/python/cpython/issues/145599 Issue Tracking
- https://github.com/python/cpython/pull/145600 Patch
- https://mail.python.org/archives/list/[email protected]/thread/H6CADMBCDRFGWCMOXWUIHFJNV43GABJ7/ Third Party Advisory