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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:LAttack ComplexityLow
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:HIntegrityHigh
A:NAvailabilityNone
Weaknesses
Affected Products
Red Hat Inc.
commercial·USaka red hat
djangoproject
oss-projectaka django
Canonical Ltd.
commercial·GBaka canonical
ООО «Ред Софт»
commercial·RUaka red soft
Django Software Foundation
oss-project·USaka django
and 1 more affected products View all →
Exploitability
Official Patch Available
Attack Graph
Products CVE Techniques Tactics
Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.
MITRE ATT&CK
1 technique Initial Access
References
https://docs.djangoproject.com/en/dev/releases/security/
docs.djangoproject.com
https://groups.google.com/g/django-announce
groups.google.com
https://www.djangoproject.com/weblog/2026/apr/07/security-releases/
djangoproject.com
and 6 more references View all →
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