Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5.
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Affected Vendors & Products
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History
Fri, 13 Mar 2026 00:15:00 +0000
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| Weaknesses | CWE-770 | |
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threat_severity
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cvssV3_1
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Thu, 12 Mar 2026 20:15:00 +0000
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ssvc
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Thu, 12 Mar 2026 10:15:00 +0000
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Tornadoweb
Tornadoweb tornado |
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Tornadoweb
Tornadoweb tornado |
Wed, 11 Mar 2026 19:45:00 +0000
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| Description | Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5. | |
| Title | Tornado has a DoS due to too many multipart parts | |
| Weaknesses | CWE-400 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-11T19:27:23.380Z
Updated: 2026-03-12T19:55:50.969Z
Reserved: 2026-03-10T15:40:10.481Z
Link: CVE-2026-31958
Updated: 2026-03-12T19:55:47.727Z
Status : Awaiting Analysis
Published: 2026-03-11T20:16:16.617
Modified: 2026-03-12T21:08:22.643
Link: CVE-2026-31958