#VU125093 Improper input validation in Django - CVE-2026-3902

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Main Vulnerability Database Vulnerabilities #VU125093

#VU125093 Improper input validation in Django - CVE-2026-3902

Published: April 7, 2026


Vulnerability identifier: #VU125093
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-3902
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Django
Software vendor:
Django Software Foundation

Description

The vulnerability allows a remote attacker to spoof security-sensitive headers.

The vulnerability exists due to improper input validation in ASGIRequest when processing request headers. A remote attacker can supply a header name with underscores to spoof security-sensitive headers.

This issue affects ASGI deployments where hyphenated and underscored header names may be treated ambiguously.


Remediation

Install security update from vendor's website.

External links