HIGH7.5

PYSEC-2026-51

Quick fix

PYSEC-2026-51 — django: upgrade to the fixed version with the command below.

pip install --upgrade 'django>=4.2.30'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/django

Introduced in: 4.2Fixed in: 4.2.30

Fixpip install --upgrade 'django>=4.2.30'

References

https://groups.google.com/g/django-announce[ADVISORY]
https://docs.djangoproject.com/en/dev/releases/security/[FIX]
https://www.djangoproject.com/weblog/2026/apr/07/security-releases/[FIX]
https://github.com/advisories/GHSA-mvfq-ggxm-9mc5[ADVISORY]