Amazon Linux 2023 Security Advisory: ALAS2023-2026-1502
Advisory Released Date: 2026-04-01
Advisory Updated Date: 2026-04-01
Severity:
Important
Issue Overview:
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. (CVE-2026-31958)
Affected Packages:
python-tornado
Issue Correction:
Run dnf update python-tornado --releasever 2023.10.20260330 or dnf update --advisory ALAS2023-2026-1502 --releasever 2023.10.20260330 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
aarch64:
python3-tornado-debuginfo-6.1.0-2.amzn2023.0.7.aarch64
python-tornado-debugsource-6.1.0-2.amzn2023.0.7.aarch64
python-tornado-doc-6.1.0-2.amzn2023.0.7.aarch64
python3-tornado-6.1.0-2.amzn2023.0.7.aarch64
src:
python-tornado-6.1.0-2.amzn2023.0.7.src
x86_64:
python3-tornado-debuginfo-6.1.0-2.amzn2023.0.7.x86_64
python-tornado-debugsource-6.1.0-2.amzn2023.0.7.x86_64
python-tornado-doc-6.1.0-2.amzn2023.0.7.x86_64
python3-tornado-6.1.0-2.amzn2023.0.7.x86_64