PT-2026-92104 · Tornado · Tornado
CVE-2026-91990
·
Published
2026-09-01
·
Updated
2026-09-30
CVSS v4.0
8.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Name of the Vulnerable Software and Affected Versions
Tornado versions prior to 6.5.8
Description
A memory amplification issue exists in the
parse multipart form data() function within httputil.py. The software performs a split operation on multipart data using the data.split() method before validating the max parts limit. An attacker can send a crafted HTTP request containing a large number of parts, which forces the server to create a massive transient list in memory. This process can exhaust server resources and lead to a denial of service. This issue can be exploited by unauthenticated users.Recommendations
Update to version 6.5.8 or later.
Exploit
Fix
Allocation of Resources Without Limits
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Weakness Enumeration
Related Identifiers
Affected Products
Tornado