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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-3902

ASGI header spoofing via underscore/hyphen conflation

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

djangoproject Django

Default version status: unaffected

  • 6.0 to < 6.0.4affected
  • 6.0.4unaffected
  • 5.2 to < 5.2.13affected
  • 5.2.13unaffected
  • 4.2 to < 4.2.30affected
  • 4.2.30unaffected

References