Allocation of Resources Without Limits or Throttling Affecting python-multipart package, versions [,0.0.27)
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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Start learning- Snyk IDSNYK-PYTHON-PYTHONMULTIPART-16438952
- published7 May 2026
- disclosed6 May 2026
- creditSinhSinh An,intadd
Introduced: 6 May 2026
NewCVE-2026-42561 (opens in a new tab)How to fix?
Upgrade python-multipart to version 0.0.27 or higher.
Overview
python-multipart is an A streaming multipart parser for Python
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling when parsing multipart headers in MultipartParser, which can hang without failing in the following states: HEADER_FIELD_START, HEADER_FIELD, HEADER_VALUE_START, HEADER_VALUE, and HEADER_VALUE_ALMOST_DONE. An attacker can cause excessive CPU consumption and disrupt service availability by sending requests with either a very large individual header value or numerous repeated headers without terminating the header block.