HarborGuard / CVE
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HIGHCVE-2026-3902Published Modified CNA DSF

CVE-2026-3902: ASGI header spoofing via underscore/hyphen conflation

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.

Metrics

CVSS v3.1
7.5
Severity
HIGH
Fixed in
4.2.30
Affected Products
1

Fix available

4.2.305.2.136.0.4
Affected packages
  • djangoproject / Django
    < 6.0.4 (from 6.0) · < 5.2.13 (from 5.2) · < 4.2.30 (from 4.2)
    Fixed in 6.0.4, 5.2.13, 4.2.30
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
References