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

Solution

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Workaround

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History

Wed, 21 Jan 2026 20:30:00 +0900

Type Values Removed Values Added
First Time appeared Python
Python cpython
Vendors & Products Python
Python cpython

Wed, 21 Jan 2026 08:15:00 +0900


Wed, 21 Jan 2026 07:45:00 +0900


Wed, 21 Jan 2026 06:45:00 +0900

Type Values Removed Values Added
Description User-controlled header names and values containing newlines can allow injecting HTTP headers.
Title wsgiref.headers.Headers allows header newline injection
Weaknesses CWE-74
References
Metrics cvssV4_0

{'score': 5.9, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-01-21T16:14:52.038Z

Reserved: 2026-01-12T16:07:56.781Z

Link: CVE-2026-0865

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-01-20T22:15:52.800

Modified: 2026-01-20T23:16:05.933

Link: CVE-2026-0865

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-21T20:18:52Z

Weaknesses