{"id":"CVE-2026-103261","published":"2026-10-01T11:17:20.847","lastModified":"2026-10-01T15:17:26.580","description":"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.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-770"],"vendors":[],"products":[],"references":[{"url":"https://github.com/tornadoweb/tornado/commit/03945136ea9746eccf61caf88edae39642e59c93","tags":[]},{"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-3hv7-mjh2-fv65","tags":[]},{"url":"https://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-query-string","tags":[]}],"exploitRefs":[{"url":"https://github.com/tornadoweb/tornado/commit/03945136ea9746eccf61caf88edae39642e59c93","tags":[]},{"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-3hv7-mjh2-fv65","tags":[]}],"hasPoc":true,"ai":null}