CVE-2024-24762Public exploitNetwork attack vector

Service hang via pathological Content-Type option

Published Feb 5, 2024 · Updated May 9, 2025

Regular expression denial of service in python-multipart before 0.0.7 allows remote attackers to hang form-processing applications. parse_options_header applies a backtracking custom regular expression to attacker-controlled Content-Type options, stalling the main event loop for minutes or longer. Exposure requires form-data parsing through python-multipart; affected FastAPI before 0.109.1 and Starlette before 0.36.2 services stop handling requests.

CVSS severity7.5
High
EPSS probability1.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in python-multipart before 0.0.7 allows remote attackers to hang form-processing applications. parse_options_header applies a backtracking custom regular expression to attacker-controlled Content-Type options, stalling the main event loop for minutes or longer. Exposure requires form-data parsing through python-multipart; affected FastAPI before 0.109.1 and Starlette before 0.36.2 services stop handling requests.

The record

CVE
CVE-2024-24762
Published
Feb 5, 2024
Updated
May 9, 2025
Vendor
Kludex
Product
python-multipart
Classifications
CWE-400, CWE-1333, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 2024CVE publishedPublication date reported by the CVE source.
  2. May 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kludex · python-multipartversion=0 <0.0.7
Tiangolo · FastAPIversion=0 <0.109.1
Kludex · Starletteversion=0 <0.36.2

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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