CVE-2026-116578
Publication date 26 October 2026
Last updated 28 October 2026
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| python-tornado | 26.10 stonking |
Needs evaluation
|
| 26.04 LTS resolute |
Needs evaluation
|
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
Severity score breakdown
CVSS version: CVSS v4.0
Base score
2.1 · Low
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-116578
- https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw9p-v7r6-gx4p
- https://github.com/tornadoweb/tornado/pull/3786
- https://github.com/tornadoweb/tornado/commit/940ea725bdd9bc68231d68a105eef17ea6e11233
- https://github.com/tornadoweb/tornado/commit/cc75ab0eb3af459c714895a49f682ad354f50117
- https://github.com/tornadoweb/tornado/commit/ccb6a2e5482f17997efd4a74b8200d5b4babc035
- https://github.com/tornadoweb/tornado/releases/tag/v6.6.0