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
| Release | Package | Fixed 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
-
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
-
web
https://alas.aws.amazon.com/cve/html/CVE-2026-31958.html