Allocation of Resources Without Limits or Throttling Affecting tornado package, versions [,6.6)
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-21755375
- published27 Oct 2026
- disclosed26 Oct 2026
- creditUttej Badwane
Introduced: 26 Oct 2026
NewCVE-2026-115927 (opens in a new tab)How to fix?
Upgrade tornado to version 6.6 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 via _read_chunked_body in http1connection.py, where reads of body data that has already arrived complete without yielding control to the event loop. An attacker can send an HTTP request with a chunked body composed of many small chunks, causing the event loop to be blocked for the entire duration of the body read - potentially minutes with the default max_body_size - and preventing the server from processing other requests.