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CVE-2026-3902PYSEC-2026-51BIT-DJANGO-2026-3902GHSA-MVFQ-GGXM-9MC5

ASGI header spoofing via underscore/hyphen conflation

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 6.0.4, 5.2.13, 4.2.30
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • django

    From 6.0 · fixed in 6.0.4; From 5.2 · fixed in 5.2.13; From 4.2 · fixed in 4.2.30

  • djangoPyPI

    From 4.2 · fixed in 4.2.30; From 5.2 · fixed in 5.2.13; From 6.0 · fixed in 6.0.4

  • djangoPyPI

    From 6.0 · fixed in 6.0.4

  • djangoPyPI

    From 5.2 · fixed in 5.2.13

  • djangoPyPI

    From 4.2 · fixed in 4.2.30

References 3

docs.djangoproject.com

groups.google.com

djangoproject.com