# CVE-2024-53981: python-multipart: python-multipart is a streaming multipart parser for Python

CVE-2024-53981 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2024-53981, released December 2, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-53981
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0064
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 2, 2024

## Description

python-multipart is a streaming multipart parser for Python. When parsing form data, python-multipart skips line breaks (CR \r or LF \n) in front of the first boundary and any tailing bytes after the last boundary. This happens one byte at a time and emits a log event each time, which may cause excessive logging for certain inputs. An attacker could abuse this by sending a malicious request with lots of data before the first or after the last boundary, causing high CPU load and stalling the processing thread for a significant amount of time. In case of ASGI application, this could stall the event loop and prevent other requests from being processed, resulting in a denial of service (DoS). This vulnerability is fixed in 0.0.18.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-multipart Debian 13.5 (trixie) | 0.0.20-1 | [DEBIAN-CVE-2024-53981](https://patchblox.com/security/data/fix/linux/debian-cve-2024-53981.md) | Dec 2, 2024 |
| Linux | python-multipart Debian 14 | 0.0.20-1 | [DEBIAN-CVE-2024-53981](https://patchblox.com/security/data/fix/linux/debian-cve-2024-53981.md) | Dec 2, 2024 |
| Linux | python-python-multipart opensuse-leap 15.6 | 0.0.9-150600.3.3.1 | [SUSE-SU-2024:4194-1](https://patchblox.com/security/data/fix/linux/suse-su-2024-4194-1.md) | Dec 5, 2024 |
| Linux | python3-multipart Ubuntu 22.04.1 LTS (jammy) | 0.0.5-2ubuntu0.1~esm1 | [python3-multipart 0.0.5-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-python3-multipart-0.0.5-2ubuntu0.1-esm1.md) | Jan 26, 2026 |
| Linux | python3-multipart Ubuntu 24.04.5 LTS (noble) | 0.0.9-1ubuntu0.1~esm1 | [python3-multipart 0.0.9-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-python3-multipart-0.0.9-1ubuntu0.1-esm1.md) | Jan 26, 2026 |

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Data as of 2026-11-10T01:44:33Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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