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tornado: Tornado Quadratic DoS via Repeated Header Coalescing

🗓️ 10 Feb 2026 20:17:03Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 4 Views

Tornado DoS via repeated headers in Http headers.add blocks the event loop through string concatenation.

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Rows per page
OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.0aarch64pcs0.11.1-10.el9_0.10pcs-0.11.1-10.el9_0.10.aarch64.rpm
Red Hat Enterprise Linux9.0ppc64lepcs0.11.1-10.el9_0.10pcs-0.11.1-10.el9_0.10.ppc64le.rpm
Red Hat Enterprise Linux9.0s390xpcs0.11.1-10.el9_0.10pcs-0.11.1-10.el9_0.10.s390x.rpm
Red Hat Enterprise Linux9.0x86_64pcs0.11.1-10.el9_0.10pcs-0.11.1-10.el9_0.10.x86_64.rpm
Red Hat Enterprise Linux9.0aarch64pcs-snmp0.11.1-10.el9_0.10pcs-snmp-0.11.1-10.el9_0.10.aarch64.rpm
Red Hat Enterprise Linux9.0ppc64lepcs-snmp0.11.1-10.el9_0.10pcs-snmp-0.11.1-10.el9_0.10.ppc64le.rpm
Red Hat Enterprise Linux9.0s390xpcs-snmp0.11.1-10.el9_0.10pcs-snmp-0.11.1-10.el9_0.10.s390x.rpm
Red Hat Enterprise Linux9.0x86_64pcs-snmp0.11.1-10.el9_0.10pcs-snmp-0.11.1-10.el9_0.10.x86_64.rpm

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19 Jul 2026 17:33Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.17.5
EPSS0.00403
SSVC
CWE-400
TornadoDenial of serviceHttp headersHeader repetitionString concatenationEvent loop
4