Tornado: Urlencoded body parsing omits max_num_fields, so one request can stall the event loop
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| tornadoweb | tornado | affected |
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Github GHSA |
GHSA-mpf4-983q-p7j4 | Tornado: Urlencoded body parsing omits max_num_fields, so one request can stall the event loop |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.346% probability within 30 days)
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ssvc
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| First Time appeared |
Tornadoweb
Tornadoweb tornado |
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| Vendors & Products |
Tornadoweb
Tornadoweb tornado |
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| Description | 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. | |
| Title | Tornado: Urlencoded body parsing omits max_num_fields, so one request can stall the event loop | |
| Weaknesses | CWE-1284 CWE-400 |
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| Metrics |
cvssV3_1
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