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VulnerabilityPublished

CVE-2026-126347: tornadoweb tornado · Open Redirect

Affects tornadoweb tornadoSource CVE Database V5

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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

CVSS 3.1 base score
3.1Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.13.1
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
tornadowebtornadoAffected
  • <6.6.1
Fixed in
  • 6.6.1

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.

References

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