PYSEC-2024-38

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2024-24762: 1.52% estimated exploitation activity in the next 30 days; percentile 74.66 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

FastAPI is a web framework for building APIs with Python 3.8+ based on standard Python type hints. 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. It's a ReDoS(Regular expression Denial of Service), it only applies to those reading form data, using `python-multipart`. This vulnerability has been patched in version 0.109.1.

Published by the source

12 Feb 2024, 17:28 UTC

Last modified by the source

7 Jul 2026, 17:56 UTC

Source last checked

24 Oct 2026, 04:13 UTC

1. Revision 2 · amended · 24 Oct 2026

   Amended from osv record PYSEC-2024-38

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-2jv5-9r88-3w3p

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2024-24762

Advisory: PYSEC-2024-38
IDs: CVE-2024-24762, GHSA-2jv5-9r88-3w3p
Record: https://patchnext.com/advisories/cve-2024-24762 (revision 2, source checked 24 Oct 2026, 04:13 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: python-multipart 0.0.7; fastapi 0.109.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI python-multipart: affected < 0.0.7; fixed in 0.0.7
- PyPI fastapi: affected < 0.109.1; fixed in 0.109.1

## Suggested inspection (read-only)
- `python -m pip show python-multipart`: prints the installed version. Run with the environment that serves production active.
- `python -m pip show fastapi`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on python-multipart, fastapi.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-2jv5-9r88-3w3p (OSV record GHSA-2jv5-9r88-3w3p lists affected ranges: PyPI python-multipart >=0 <0.0.7 (fixed))
- Verified: https://osv.dev/vulnerability/PYSEC-2024-38 (OSV record PYSEC-2024-38 lists affected ranges: PyPI fastapi >=0 <0.109.1 (fixed))

Commands are suggestions: review each one before running it.