Resource Exhaustion Affecting python-tornado package, versions *
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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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-PYTHONTORNADO-19477310
- published1 Sept 2026
- disclosed31 Aug 2026
Introduced: 31 Aug 2026
NewCVE-2026-82397 (opens in a new tab)How to fix?
There is no fixed version for Debian:unstable python-tornado.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-tornado package and not the python-tornado package as distributed by Debian.
See How to fix? for Debian:unstable 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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-82397
- https://github.com/tornadoweb/tornado/commit/8d6363ed7b69d5f0da806efe34d256627a2191de
- https://github.com/tornadoweb/tornado/pull/3704
- https://github.com/tornadoweb/tornado/releases/tag/v6.5.8
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-mpf4-983q-p7j4