CVE-2026-82397
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded requ
CVSS
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Exploit Today
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Publicado: 31 ago 2026 · Última mod.: 2 sept 2026 · CWE-400 · CWE-1284
0.4%EPSS · 30 días0.4%
2026-09-012026-09-02
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.
- github.comhttps://github.com/tornadoweb/tornado/commit/8d6363ed7b69d5f0da806efe34d256627a2191de
- github.comhttps://github.com/tornadoweb/tornado/pull/3704
- github.comhttps://github.com/tornadoweb/tornado/releases/tag/v6.5.8
- github.comhttps://github.com/tornadoweb/tornado/security/advisories/GHSA-mpf4-983q-p7j4
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CVE-2026-848884.3 MED—
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