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CVE-2025-67724

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Date: December 12, 2025

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 "reason" phrases (the "Not Found" in HTTP/1.1 404 Not Found) to the HTTP status line (mainly for non-standard status codes). This issue is fixed in version 6.5.3.

Severity Score

Related Resources (5)

https://github.com/tornadoweb/tornado/security/advisories/GHSA-pr2v-jx2c-wg9f
https://nvd.nist.gov/vuln/detail/CVE-2025-67724
https://github.com/tornadoweb/tornado/commit/9c163aebeaad9e6e7d28bac1f33580eb00b0e421
https://github.com/tornadoweb/tornado/releases/tag/v6.5.3
https://www.mend.io/vulnerability-database/CVE-2025-67724

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Improper Neutralization of HTTP Headers for Scripting Syntax

CWE-644

Top Fix

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Upgrade Version

Upgrade to version tornado - 6.5.3;https://github.com/tornadoweb/tornado.git - v6.5.3

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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