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High ALAS2023-2026-1502 1 CVE

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

Published Mar 30, 2026 · Updated Apr 1, 2026

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-31958: 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.

Fixed packages 4

ReleasePackageFixed in
Amazon Linux · 2023 python-tornado-debugsource 0:6.1.0-2.amzn2023.0.7
Amazon Linux · 2023 python-tornado-doc 0:6.1.0-2.amzn2023.0.7
Amazon Linux · 2023 python3-tornado 0:6.1.0-2.amzn2023.0.7
Amazon Linux · 2023 python3-tornado-debuginfo 0:6.1.0-2.amzn2023.0.7

Vulnerabilities 1

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-31958.html