CVE-2026-0672 MEDIUM

CVE-2026-0672: Header injection in http.cookies.Morsel

Vendor Python Software Foundation
Product CPython
Weakness CWE-93 · CRLF injection
Published January 20, 2026
Last update March 3, 2026
View on NVD All CVEs

CVSS base score

6.0/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 20, 2026 CVE published
March 3, 2026 Record updated