CVE-2026-33033: Django has potential DoS via MultiPartParser through crafted multipart uploads

April 7, 2026 (updated April 8, 2026)

An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. MultiPartParser allows remote attackers to degrade performance by submitting multipart uploads with Content-Transfer-Encoding: base64 including excessive whitespace.

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 Seokchan Yoon for reporting this issue.

References

docs.djangoproject.com/en/dev/releases/security
github.com/advisories/GHSA-5mf9-h53q-7mhq
github.com/django/django
groups.google.com/g/django-announce
nvd.nist.gov/vuln/detail/CVE-2026-33033
www.djangoproject.com/weblog/2026/apr/07/security-releases

Code Behaviors & Features

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