Allocation of Resources Without Limits or Throttling Affecting tornado package, versions [,6.5.8)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-TORNADO-19477041
- published1 Sept 2026
- disclosed31 Aug 2026
- creditarpitjain099
Introduced: 31 Aug 2026
NewCVE-2026-82397 (opens in a new tab)How to fix?
Upgrade tornado to version 6.5.8 or higher.
Overview
tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through parse_body_arguments in tornado/httputil.py and parse_qs_bytes in tornado/escape.py. An attacker can stall the event loop and block the server by sending an application/x-www-form-urlencoded request body containing a huge number of separators and arguments. The body is parsed synchronously before the handler runs, so one oversized form request can consume excessive CPU and prevent the server from serving other connections.