CVE-2025-67724 - Tornado vulnerable to Header Injection and XSS via reason argument

CVE ID : CVE-2025-67724 Published : Dec. 12, 2025, 5:36 a.m. | 9 minutes ago Description : Tornado is a Python web framework and asynchronous networking library. In versions 6.5.2 and below, the supplied reason phrase is used unescaped in HTTP headers (where it could be used for header injection) or in HTML in the default error page (where it could be used for XSS) and can be exploited by passing untrusted or malicious data into the reason argument. Used by both RequestHandler.set_status and tornado.web.HTTPError, the argument is designed to allow applications to pass custom

Source: Telegram CVE Monitor