CVE-2026-33033

Potential denial-of-service vulnerability in MultiPartParser via base64-encoded file upload

State: Published
Severity: 6.5 Medium
Published: Apr 7, 2026
Updated: Apr 7, 2026
Reserved: Mar 17, 2026

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. `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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
Djangodjangoproject	6.0 to before 6.0.4Affected 6.0.4Not affected 5.2 to before 5.2.13Affected 5.2.13Not affected 4.2 to before 4.2.30Affected 4.2.30Not affected

References

Django security archivevendor-advisory
Django releases announcementsmailing-list
Django security releases issued: 6.0.4, 5.2.13, and 4.2.30vendor-advisory

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