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7.5 High

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

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.

Affected products and versions

Product Affected versions Fixed in
python-multipart 0.0 earliest → < 0.0.18 0.0.18

References

Timeline

  1. Published
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Other CVEs of python-multipart

The 9 CVEs of python-multipart →
CVE-2026-53540 Python-Multipart is a streaming multipart parser for Python 3.7 Low CVE-2026-53537 Python-Multipart is a streaming multipart parser for Python 3.7 Low CVE-2026-53538 Python-Multipart is a streaming multipart parser for Python 3.7 Low CVE-2026-53539 Python-Multipart is a streaming multipart parser for Python 7.5 High
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