Summary
Package updates are available for Amazon Linux 2 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 3
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | python3-tornado | 0:5.0.2-4.amzn2.0.7 |
| Amazon Linux · 2 | python3-tornado-debuginfo | 0:5.0.2-4.amzn2.0.7 |
| Amazon Linux · 2 | python3-tornado-doc | 0:5.0.2-4.amzn2.0.7 |
Vulnerabilities 1
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High 8.7
Tornado has a DoS due to too many multipart parts
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 …
References
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-31958.html