Amazon Linux 2 Security Advisory: ALAS2-2026-3213
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:
python3-tornado
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update python3-tornado or yum update --advisory ALAS2-2026-3213 to update your system.
New Packages:
aarch64:
python3-tornado-5.0.2-4.amzn2.0.7.aarch64
python3-tornado-doc-5.0.2-4.amzn2.0.7.aarch64
python3-tornado-debuginfo-5.0.2-4.amzn2.0.7.aarch64
i686:
python3-tornado-5.0.2-4.amzn2.0.7.i686
python3-tornado-doc-5.0.2-4.amzn2.0.7.i686
python3-tornado-debuginfo-5.0.2-4.amzn2.0.7.i686
src:
python3-tornado-5.0.2-4.amzn2.0.7.src
x86_64:
python3-tornado-5.0.2-4.amzn2.0.7.x86_64
python3-tornado-doc-5.0.2-4.amzn2.0.7.x86_64
python3-tornado-debuginfo-5.0.2-4.amzn2.0.7.x86_64