Inefficient Algorithmic Complexity Affecting python-multipart package, versions [,0.0.30)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-PYTHONMULTIPART-17345663
- published16 Jun 2026
- disclosed15 Jun 2026
- creditmaxisbey
Introduced: 15 Jun 2026
CVE-2026-53539 (opens in a new tab)How to fix?
Upgrade python-multipart to version 0.0.30 or higher.
Overview
python-multipart is an A streaming multipart parser for Python
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity in the QuerystringParser function when parsing application/x-www-form-urlencoded bodies containing semicolon-separated fields. An attacker can cause excessive CPU consumption by submitting specially crafted request bodies with repeated semicolon separators, leading to significant processing delays and potential exhaustion of worker processes.