CVE-2026-0865 MEDIUM

CVE-2026-0865: wsgiref.headers.Headers allows header newline injection

Vendor Python Software Foundation
Product CPython
Weakness CWE-74
Published January 20, 2026
Last update March 3, 2026
View on NVD All CVEs

CVSS base score

5.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

User-controlled header names and values containing newlines can allow injecting HTTP headers.

Key dates

02Disclosure timeline

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