CVE-2026-116578
Description
A flaw was found in Tornado. When an application configures RedirectHandler with dynamic URL templates, user-controlled input in request paths can alter the target redirect scheme or host location. A remote attacker can exploit this vulnerability by sending a crafted request to trigger an open redirect, redirecting users to an arbitrary external website. This flaw can be leveraged in phishing attacks to trick users into visiting malicious destinations while appearing to interact with a trusted domain.
Statement
Red Hat has evaluated this vulnerability as Moderate because exploitation requires victim interaction through deceptive links and is constrained to specific routing configurations using dynamic redirection handlers. Typical Red Hat product deployments utilize Tornado within internal or managed backend services without exposing vulnerable URL redirect patterns. Because the vulnerability cannot lead to unauthorized host access, data leakage, or service disruption, the practical risk is largely confined to client-side phishing scenarios.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.1 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Changed | N/A | N/A |
| Confidentiality | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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