CVE-2026-103261 — Tornado before 6.5.9 Denial of Service via Query String
Tornado before 6.5.9 fails to limit the number of query string fields in HTTPServerRequest.__init__, allowing remote attackers to cause event-loop stalling by sending requests w…
Published: 2026-10-01 · CVSS: 6.9 · CVSS 4.0
Tornado before 6.5.9 fails to limit the number of query string fields in HTTPServerRequest.__init__, allowing remote attackers to cause event-loop stalling by sending requests with thousands of query parameters. Attackers can send unauthenticated GET requests with unbounded query-string field counts to degrade response times for all clients sharing the same IOLoop.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7