Python-Multipart is a streaming multipart parser for Python.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Apr 18, 2026 · NIST NVD

   Detected

   Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.

2. Jun 17, 2026 · NIST NVD

   Updated

   Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the next boundary candidate when processing leading CR/LF data and immediately discards epilogue data after the closing boundary.

Affected

• cpe fastapiexpert/python-multipartversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-40347

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-40347

  Python-Multipart is a streaming multipart parser for Python. Versions prior to 0.0.26 have a denial of service vulnerability when parsing crafted requests with large preamble or epilogue sections. Upgrade to version 0.0.26 or later, which skips ahead to the

  nvd.nist.gov

References

• Product · github.com
• Vendor Advisory · github.com