medium5.3
CVE-2026-103261
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 …
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Tornado | before 6.5.9 |
Versions were read from the advisory text. No structured product data has been published for this record yet.