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High severityNVD Advisory· Published May 15, 2025· Updated May 29, 2025

Tornado vulnerable to excessive logging caused by malformed multipart form data

CVE-2025-47287

Description

Tornado is a Python web framework and asynchronous networking library. When Tornado's `multipart/form-data parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the logging subsystem is synchronous. All versions of Tornado prior to 6.5.0 are affected. The vulnerable parser is enabled by default. Upgrade to Tornado version 6.50 to receive a patch. As a workaround, risk can be mitigated by blocking Content-Type: multipart/form-data` in a proxy.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
tornadoPyPI
< 6.56.5

Affected products

116

Patches

Vulnerability mechanics

References

5

News mentions

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