TI-2024-16279 Aliases CVE-2024-24762 GHSA-2jv5-9r88-3w3p

python-multipart vulnerable to content-type header Regular expression Denial of Service

HIGH 72CWE-400Published 2024-02-05 · Updated 2025-05-09

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

`python-multipart` is a streaming multipart parser for Python. When using form data, `python-multipart` uses a Regular Expression to parse the HTTP `Content-Type` header, including options. An attacker could send a custom-made `Content-Type` option that is very difficult for the RegEx to process, consuming CPU resources and stalling indefinitely (minutes or more) while holding the main event loop. This means that process can't handle any more requests, leading to regular expression denial of service. This vulnerability has been patched in version 0.0.7.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01523 74th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed python-multipart (Kludex): 0.0.7fastapi (tiangolo): 0.109.1+2 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Kludex	python-multipart	before 0.0.7	0.0.7	Patch available	CNA
tiangolo	fastapi	before 0.109.1	0.109.1	Patch available	CNA
encode	starlette	before 0.36.2	0.36.2	Patch available	CNA
—	python-multipart (PyPI)	before 0.0.7	0.0.7	Patch available	GHSA-2jv5-9r88-3w3p

python-multipart VendorKludex Affected before 0.0.7 Fixed in 0.0.7 Patch available CNA
fastapi Vendortiangolo Affected before 0.109.1 Fixed in 0.109.1 Patch available CNA
starlette Vendorencode Affected before 0.36.2 Fixed in 0.36.2 Patch available CNA
python-multipart (PyPI) Vendor— Affected before 0.0.7 Fixed in 0.0.7 Patch available GHSA-2jv5-9r88-3w3p

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:fastapiexpert:python-multipart::::::python::*	before 0.0.7	Vulnerable	Fastapiexpert
cpe:2.3:a:encode:starlette::::::python::*	before 0.36.2	Running on	encode
cpe:2.3:a:tiangolo:fastapi::::::::	before 0.109.1	Running on	tiangolo

cpe:2.3:a:fastapiexpert:python-multipart:*:*:*:*:*:python:*:* Versions before 0.0.7 Vulnerable ·Fastapiexpert
cpe:2.3:a:encode:starlette:*:*:*:*:*:python:*:* Versions before 0.36.2 Running on ·encode
cpe:2.3:a:tiangolo:fastapi:*:*:*:*:*:*:*:* Versions before 0.109.1 Running on ·tiangolo

Remediation

Fix · CNA python-multipart (Kludex) Fixed in 0.0.7
Fix · CNA fastapi (tiangolo) Fixed in 0.109.1
Fix · CNA starlette (encode) Fixed in 0.36.2
Fix · GHSA-2jv5-9r88-3w3p python-multipart (PyPI) Fixed in 0.0.7 Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-02 Threatist record created from CVE-2024-24762
2026-10-03 Alias added: GHSA-2jv5-9r88-3w3p

References

Exploit 1

https://github.com/Kludex/python-multipart/security/advisories/GHSA-2jv5-9r88-3w3p

Patch 3

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2024-24762

Other 7

TI-2025-38917 Starlette vulnerable to O(n^2) DoS via Range header merging in starlette.responses.FileResponse CVSS 3.1HIGH 7.5
TI-2026-30841 Python-Multipart: Denial of Service via unbounded multipart part headers CVSS 3.1HIGH 7.5
TI-2024-36140 python-multipart has a Denial of service (DoS) via deformation `multipart/form-data` boundary CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences