CVE-2026-103261
Public on 2026-10-01
Modified on 2026-10-03
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.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2023 | python-flit | Not Affected | ||
| Amazon Linux 2027 Preview | python-flit | Not Affected | ||
| Amazon Linux 2 - Core | python-tornado | Pending Fix | ||
| Amazon Linux 2023 | python-tornado | Pending Fix | ||
| Amazon Linux 2027 Preview | python-tornado | Pending Fix | ||
| Amazon Linux 2 - Core | python3-tornado | Pending Fix | ||
| Amazon Linux 2023 | python3.13-tornado | Pending Fix |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |