Django Authentication Bypass by Spoofing Vulnerability - CVE-2026-3902

An issue was discovered in 6.0 before 6.0.4 5.2 before 5.2.13 and 4.2 before 4.2.30. ASGIRequest allows a remote attacker to spoof headers by exploiting an ambiguous mapping of two header variants (with hyphens or with underscores) to a single version with underscores. Earlier unsupported Django series (such as 5.0.x 4.1.x and 3.2.x) were not evaluated and may also be affected. Django would like to thank Tarek Nakkouch for reporting this issue.