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Tornado: Quadratic CPU Usage When Parsing HTTP Headers With Line Folding

🗓️ 29 Oct 2026 05:15:12Reported by Veracode Vulnerability DatabaseType 
veracode
 veracode
🔗 sca.analysiscenter.veracode.com👁 9 Views

Unauthenticated DoS in Tornado via quadratic CPU usage when parsing folded headers.

Related
Detection
Refs
Vulners
Node
tornadotornadoRange0.2–6.6rc1python

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31 Oct 2026 07:34Current
7.2High risk
Vulners AI Score7.2
CVSS 3.17.5
EPSS0.00559
SSVC
9