CVE-2026-126347: tornadoweb tornado · Open Redirect
Affects tornadoweb tornadoSource CVE Database V5
Not known to be exploited · CVSS 3.1 Low : upgrade to 6.6.1 when convenient.
Data as of 12 Nov 2026, 22:06 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 3.1 |
|---|
- Patch
- Available – fixed in 6.6.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 12 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.
What to do
Upgrade tornadoweb tornado to 6.6.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| tornadowebtornado | Affected
| Fixed in
|
AI-suggested
Upgrade Tornado to version 6.6.1 or later, where this open redirect vulnerability is fixed. No other mitigation is necessary as the vendor has provided an official fix.
Description
CVE-2026-126347 is an open redirect vulnerability in the Tornado Python web framework versions prior to 6.6.1. It affects applications using tornado.web.RedirectHandler with URL templates that allow attacker-controlled input to influence the redirect destination. The vulnerability arises from differences in URL parsing between Python and browsers, allowing crafted URLs with three or more leading slashes to redirect users to attacker-controlled hosts. This issue was not fully addressed by the previous fix in version 6.6.0 and is resolved in version 6.6.1.