CVE-2026-91990 Tornado - Denial of Service

Tornado < 6.5.8 contains a denial of service vulnerability caused by improper validation of max_parts in parse_multipart_form_data, letting attackers exhaust server memory via crafted multipart requests, exploit requires no special privileges.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.42% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to version 6.5.8 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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