MultipartParser DOS with too many fields or files in Starlette Framework

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Summary

CVECVE-2023-30798
StatePUBLISHED
AssignerVulnCheck
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-04-21 16:15:07 UTC
Updated2026-07-15 02:17:07 UTC
DescriptionThere MultipartParser usage in Encode's Starlette python framework before versions 0.25.0 allows an unauthenticated and remote attacker to specify any number of form fields or files which can cause excessive memory usage resulting in denial of service of the HTTP service.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.012880000 probability, percentile 0.669630000 (date 2026-07-17)

Problem Types: CWE-400 | CWE-400 CWE-400 Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Encode Starlette All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Encode Starlette affected 0.25.0 python all

References

ReferenceSourceLinkTags
Merge pull request from GHSA-74m5-2c7w-9w3x · encode/starlette@8c74c2c · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch
MultipartParser DOS with too many fields or files in Starlette Framework | VulnCheck Advisories af854a3a-2127-422b-91ae-364da2661108 vulncheck.com Patch, Third Party Advisory
MultipartParser DOS with too many fields or files · Advisory · encode/starlette · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Mitigation, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 184402 Debian Security Update for starlette (CVE-2023-30798)

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