Allocation of Resources Without Limits or Throttling Affecting starlette package, versions [,0.47.2)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
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-STARLETTE-10874054
- published22 Jul 2025
- disclosed21 Jul 2025
- creditMichael Honaker
Introduced: 21 Jul 2025
NewCVE-2025-54121 (opens in a new tab)How to fix?
Upgrade starlette to version 0.47.2 or higher.
Overview
starlette is a The little ASGI library that shines.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the UploadFile.write method when handling multipart forms containing files larger than the default spool_max_size. An attacker can cause the application to block the main event thread by submitting a multipart form with a large file, preventing the application from accepting new connections.