| Name | CVE-2026-116578 |
| Description | Tornado is a Python web framework and asynchronous networking library. Prior to 6.6, tornado.web.RedirectHandler URL templates can place regex-capture substitutions where crafted request paths change the redirect scheme or network location. Affected placements include substitutions at the start of a path, directly after a fixed host, or at the beginning of the template, including protocol-relative, absolute, backslash, encoded, host-extension, and user-info variants interpreted by browsers as attacker-controlled destinations. Static templates and substitutions after a fixed host followed by a slash are not affected. An attacker can use the resulting open redirect on the application's domain for phishing. This issue is fixed in version 6.6. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1152300 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| python-tornado (PTS) | bookworm, bookworm (security) | 6.2.0-3+deb12u4 | vulnerable |
| trixie (security), trixie | 6.4.2-3+deb13u2 | vulnerable | |
| forky, sid | 6.5.5-5 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| python-tornado | source | (unstable) | (unfixed) | 1152300 |
https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw9p-v7r6-gx4p
https://github.com/tornadoweb/tornado/pull/3786
Fixed by: https://github.com/tornadoweb/tornado/commit/940ea725bdd9bc68231d68a105eef17ea6e11233 (v6.6.0b1)
Fixed by: https://github.com/tornadoweb/tornado/commit/cc75ab0eb3af459c714895a49f682ad354f50117 (v6.6.0rc1)
Fixed by: https://github.com/tornadoweb/tornado/commit/ccb6a2e5482f17997efd4a74b8200d5b4babc035 (v6.6.0rc1)