CVE-2026-0672

MEDIUM

CPython HTTP Header Injection via http.cookies.Morsel

Title source: llm
STIX 2.1

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.

References (9)

Core 9
Core References
Issue Tracking issue-tracking
https://github.com/python/cpython/issues/143919

Scores

CVSS v4 6.0
EPSS 0.0040
EPSS Percentile 31.6%
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

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-93
Status published
Products (6)
Python Software Foundation/CPython < 3.10.20
Python Software Foundation/CPython 3.11.0 - 3.11.15
Python Software Foundation/CPython 3.12.0 - 3.12.13
Python Software Foundation/CPython 3.13.0 - 3.13.12
Python Software Foundation/CPython 3.14.0 - 3.14.3
Python Software Foundation/CPython 3.15.0a1 - 3.15.0a6
Published Jan 20, 2026
Tracked Since Feb 18, 2026