DEBIAN-CVE-2025-67724
Record from OSV · Published 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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| python-tornado | Debian:12 | 6.2.0-3+deb12u4 |
| python-tornado | Debian:14 | 6.5.4-0.1 |
| python-tornado | Debian:13 | 6.4.2-3+deb13u2 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | python-tornado | 0, 6.2.0-3, 6.2.0-3+deb12u1 |
| Debian:14 | python-tornado | 0, 6.4.2-3, 6.5.2-1 |
| Debian:13 | python-tornado | 0, 6.4.2-3, 6.4.2-3+deb13u1 |
Timeline
- Dec 12, 2025 CVE Published
- Oct 8, 2026 CVE Updated
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