AIKIDO-2026-729097
tornado is vulnerable to Cross-Site Scripting (XSS)
54
Medium Risk
This Affects:
tornadoTL;DR
The reason argument (used by both RequestHandler.set_status and tornado.web.HTTPError) is designed to allow applications to pass custom "reason" phrases (the "Not Found" in HTTP/1.1 404 Not Found) to the HTTP status line (mainly for non-standard status codes).
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and if untrusted data is passed to the reason argument.
Background info
tornado is vulnerable to Cross-Site Scripting (XSS) in versions 0.0.0 - 6.5.2.
How to fix this
Upgrade the tornado library to the patch version.
Links
GitHub Release
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