Cross-site Scripting (XSS) Affecting python3.13-tornado-debuginfo package, versions <0:6.4.2-1.amzn2023.0.2


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.24% (15th percentile)

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  • Snyk IDSNYK-AMZN2023-PYTHON313TORNADODEBUGINFO-15922203
  • published7 Apr 2026
  • disclosed12 Dec 2025

Introduced: 12 Dec 2025

CVE-2025-67724  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 python3.13-tornado-debuginfo to version 0:6.4.2-1.amzn2023.0.2 or higher.
This issue was patched in ALAS2023-2026-1528.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3.13-tornado-debuginfo package and not the python3.13-tornado-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1