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CVE-2026-3902

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-3902

Severity

7.5

High

CVSS V3

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Summary

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.

References

Affected packages

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