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

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Summary

CVECVE-2026-33033
StatePUBLISHED
AssignerDSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-07 15:17:39 UTC
Updated2026-04-07 16:16:24 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-407 | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Djangoproject Django affected 6.0 6.0.4 semver Not specified
CNA Djangoproject Django unaffected 6.0.4 semver Not specified
CNA Djangoproject Django affected 5.2 5.2.13 semver Not specified
CNA Djangoproject Django unaffected 5.2.13 semver Not specified
CNA Djangoproject Django affected 4.2 4.2.30 semver Not specified
CNA Djangoproject Django unaffected 4.2.30 semver Not specified

References

ReferenceSourceLinkTags
groups.google.com/g/django-announce 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 groups.google.com
docs.djangoproject.com/en/dev/releases/security 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 docs.djangoproject.com
www.djangoproject.com/weblog/2026/apr/07/security-releases 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 www.djangoproject.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Seokchan Yoon (en)

CNA: Natalia Bidart (en)

CNA: Jacob Walls (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-02-19T12:00:00.000ZInitial report received.
CNA2026-03-17T12:00:00.000ZVulnerability confirmed.
CNA2026-04-07T09:00:00.000ZSecurity release issued.
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