Nitro has an Open Redirect via Protocol-Relative URL Bypass in Wildcard Route Rules — CVE-2026-44372

Summary

A redirect route rule like: ```ts routeRules: { "/legacy/**": { redirect: "/**" } } ``` is intended to rewrite paths within the same host. Before the patch, an attacker could turn the rewrite into a cross-host redirect by sliding an extra slash in after the rule prefix. Example exploit: ``` GET /legacy//evil.com ``` Nitro stripped `/legacy` from the matched pathname and joined the remainder against the rule's…

Product

npm: nitro | npm: nitropack

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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