CVE-2026-91990
Tornado before 6.5.8 Memory Amplification DoS via multipart
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Tornado before 6.5.8 contains a memory amplification vulnerability in parse_multipart_form_data that splits multipart data before validating the max_parts limit. Attackers can send crafted multipart requests with many parts to create large transient lists, exhausting server memory and causing denial of service.
| CWE | CWE-770 |
| Vendor | tornadoweb |
| Product | tornado |
| Published | Sep 15, 2026 |
| Last Updated | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
tornadoweb / tornado
0 < 6.5.8