VulnerabilityDeferred
CVE-2026-0672
When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages.
MEDIUM 6.0EPSS 0.43%
Does this matter?
Lower severity and a low EPSS score (0.43%). Track it; it rarely justifies an emergency change on its own.
Description
When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.
- CVSS 4.0
- 6.0 MEDIUMCVSS: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/M
- EPSS
- 0.43% probability · 36th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-93
- Source
- cna@python.org
References
- https://github.com/python/cpython/commit/62700107418eb2cca3fc88da036a243ea975f172
- https://github.com/python/cpython/commit/712452e6f1d4b9f7f8c4c92ebfcaac1705faa440
- https://github.com/python/cpython/commit/7852d72b653fea0199acf5fc2a84f6f8b84eba8d
- https://github.com/python/cpython/commit/918387e4912d12ffc166c8f2a38df92b6ec756ca
- https://github.com/python/cpython/commit/95746b3a13a985787ef53b977129041971ed7f70
- https://github.com/python/cpython/commit/b1869ff648bbee0717221d09e6deff46617f3e85
- https://github.com/python/cpython/issues/143919
- https://github.com/python/cpython/pull/143920
- https://mail.python.org/archives/list/security-announce@python.org/thread/6VFLQQEIX673KXKFUZXCUNE5AZOGZ45M/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.