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Medium ALAS2023-2025-1002 1 CVE

Moderate: python-tornado security update (Amazon Linux 2023)

Published Jun 4, 2025 · Updated Jun 10, 2025

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2025-47287: 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.

Fixed packages 4

ReleasePackageFixed in
Amazon Linux · 2023 python-tornado-debugsource 0:6.1.0-2.amzn2023.0.5
Amazon Linux · 2023 python-tornado-doc 0:6.1.0-2.amzn2023.0.5
Amazon Linux · 2023 python3-tornado 0:6.1.0-2.amzn2023.0.5
Amazon Linux · 2023 python3-tornado-debuginfo 0:6.1.0-2.amzn2023.0.5

Vulnerabilities 1

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2025-47287.html