CVE-2026-3902
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Django
PublishedApr 7, 2026
First seenApr 7, 2026
Weakness typeCWE-290CWE-290
How to fix
Update
- djangoproject django4.2.30, 5.2.13, 6.0.4 or later
- django6.0.4, 5.2.13, 4.2.30 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| djangoproject django | 4.2 ≤ v < 4.2.30, 5.2 ≤ v < 5.2.13, 6.0 ≤ v < 6.0.4 | 4.2.30, 5.2.13, 6.0.4 |
| djangoPyPI | 6.0 ≤ v < 6.0.4, 5.2 ≤ v < 5.2.13, 4.2 ≤ v < 4.2.30 | 6.0.4, 5.2.13, 4.2.30 |
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