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tornado: Tornado Quadratic DoS via Repeated Header Coalescing

🗓️ 21 Jan 2026 15:59:50Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 10 Views

Tornado denial of service from repeated header concatenation in headers.add blocks the event loop.

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Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.10aarch64pcs0.10.18-2.el8_10.8pcs-0.10.18-2.el8_10.8.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lepcs0.10.18-2.el8_10.8pcs-0.10.18-2.el8_10.8.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xpcs0.10.18-2.el8_10.8pcs-0.10.18-2.el8_10.8.s390x.rpm
Red Hat Enterprise Linux8.10x86_64pcs0.10.18-2.el8_10.8pcs-0.10.18-2.el8_10.8.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64pcs-snmp0.10.18-2.el8_10.8pcs-snmp-0.10.18-2.el8_10.8.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lepcs-snmp0.10.18-2.el8_10.8pcs-snmp-0.10.18-2.el8_10.8.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xpcs-snmp0.10.18-2.el8_10.8pcs-snmp-0.10.18-2.el8_10.8.s390x.rpm
Red Hat Enterprise Linux8.10x86_64pcs-snmp0.10.18-2.el8_10.8pcs-snmp-0.10.18-2.el8_10.8.x86_64.rpm

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11 Jul 2026 20:10Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.17.5
EPSS0.00403
SSVC
CWE-400
Tornado frameworkdenial of serviceheader concatenationrepeated headersevent loop blockPython strings
10