CVE-2026-0865CWE-74

wsgiref.headers.Headers allows header newline injection

Medium · published January 20, 2026

CVSS v4.0
5.9
EPSS
1%
Percentile
45.5
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v4.0
5.9 · MEDIUM
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
EPSS
0.00554 · 45.5th percentile
Weakness
CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Published
2026-01-20T21:26Z
EPSS history
Timeline
  • 20 JAN 21:26Z
    wsgiref.headers.Headers allows header newline injection
    cvelistv5