CVE-2026-33033
Potential denial-of-service vulnerability in MultiPartParser via base64-encoded file upload
- Published
- Apr 7, 2026
- Updated
- Apr 7, 2026
- Assigning CNA
- DSF
- Evidence observed
- Aug 25, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HLow · next 30 days
- Percentile
- 57.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
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. `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.
Sources
1Proof-of-concept exploit for CVE-2026-33033, a denial-of-service vulnerability in Django's MultiPartParser via base64 whitespace CPU amplification, demonstrating ~800x amplification with a single HTTP request.
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