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CVE-2026-116578 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.7 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/tornadoweb/tornado/commit/940ea725bdd9bc68231d68a105eef17ea6e11233	[email protected]	Source CodeVendor
https://github.com/tornadoweb/tornado/commit/cc75ab0eb3af459c714895a49f682ad354f50117	[email protected]	Source CodeVendor
https://github.com/tornadoweb/tornado/commit/ccb6a2e5482f17997efd4a74b8200d5b4babc035	[email protected]	Source CodeVendor
https://github.com/tornadoweb/tornado/pull/3786	[email protected]	Source CodeVendor
https://github.com/tornadoweb/tornado/releases/tag/v6.6.0	[email protected]	Release NotesVendor
https://github.com/tornadoweb/tornado/security/advisories/GHSA-pw9p-v7r6-gx4p	[email protected]	AdvisoryRemedyVendor

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-601	URL Redirection to Untrusted Site ('Open Redirect')	[email protected]

Affected Products

Product	Versions
Tornado	< 6.6
CPE cpe:2.3:a:tornadoweb:tornado:::::::: Remediation Upgrade: 6.6.0moderate effort Workaround:low effort Change `RedirectHandler` templates so every substitution comes after a fixed prefix ending in `/`, or write capture-group regexes that cannot match characters such as `/`, `\`, `@`, `.` or `:` where they could affect the host. Alternatively, replace `RedirectHandler` with a custom handler that validates the target before calling `self.redirect()`.

Product

Versions

Tornado

< 6.6

CPE

cpe:2.3:a:tornadoweb:tornado:*:*:*:*:*:*:*:*

Remediation

Upgrade: 6.6.0moderate effort
Workaround:low effort
Change `RedirectHandler` templates so every substitution comes after a fixed prefix ending in `/`, or write capture-group regexes that cannot match characters such as `/`, `\`, `@`, `.` or `:` where they could affect the host. Alternatively, replace `RedirectHandler` with a custom handler that validates the target before calling `self.redirect()`.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 30, 2026	CVE Modified	CISA-ADP
Oct 26, 2026	New CVE Received	[email protected]