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Security Advisories

CVE-2026-31958

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-31958

Severity

Unknown
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Summary

Tornado has a DoS due to too many multipart parts

Description

Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-31958

Affected packages


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