{"action":"Upgrade tornado to 6.5.9 or later.","affected":[{"fixed":"6.5.9","introduced":"0"}],"component":"tornado","cve_ids":["CVE-2026-103261"],"ecosystem":"PyPI","epss":0.00467,"exploited":false,"fixed_versions":["6.5.9"],"ghsa_id":"GHSA-3hv7-mjh2-fv65","id":"tcs_01M5KEVZABSCBMZPX2BJR7THRP","modified_at":"2026-10-02T03:56:09.601689224Z","published_at":"2026-09-30T23:49:25Z","references":["https://osv.dev/vulnerability/GHSA-3hv7-mjh2-fv65","https://github.com/tornadoweb/tornado/security/advisories/GHSA-3hv7-mjh2-fv65","https://github.com/tornadoweb/tornado/pull/3719","https://github.com/tornadoweb/tornado/commit/03945136ea9746eccf61caf88edae39642e59c93","https://github.com/tornadoweb/tornado/commit/8a61dd6005f42733015160f3c23a2bcffe200542","https://github.com/tornadoweb/tornado","https://github.com/tornadoweb/tornado/releases/tag/v6.5.9"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-3hv7-mjh2-fv65","url":"https://osv.dev/vulnerability/GHSA-3hv7-mjh2-fv65"}],"summary":"Tornado: Unbounded query-string argument count allows event-loop-stalling DoS"}