Excessive Platform Resource Consumption within a Loop Affecting python3.13-tornado-debuginfo package, versions <0:6.4.2-1.amzn2023.0.5


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.35% (26th percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON313TORNADODEBUGINFO-20245637
  • published29 Sept 2026
  • disclosed31 Aug 2026

Introduced: 31 Aug 2026

CVE-2026-82397  (opens in a new tab)
CWE-1050  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3.13-tornado-debuginfo to version 0:6.4.2-1.amzn2023.0.5 or higher.
This issue was patched in ALAS2023-2026-3092.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.13-tornado-debuginfo package and not the python3.13-tornado-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py, so an unauthenticated request body containing millions of separator-delimited fields can synchronously stall the single-threaded event loop and delay every connection. The body is bounded only by max_buffer_size, which defaults to 104857600 bytes. This issue is fixed in version 6.5.8.

CVSS Base Scores

version 3.1