CVE-2026-66754: Tomaka Rouille

Medium severity, CVSS 5.9. EPSS: 0.6% chance of exploitation in the next 30 days.

Rouille 0.1.6 through 3.6.2 contains a reachable assertion vulnerability in the Request::remove_prefix function that allows remote unauthenticated attackers to crash the server by sending a crafted percent-encoded URL. Attackers can send a request whose decoded path matches a configured prefix while the raw percent-encoded path does not, causing the assert! to fail and triggering either a 500 error or full process termination depending on the panic configuration.

Affected products

• Tomaka Rouille: from 0.1.6, up to and including 3.6.2

Published 2026-07-28. Last modified 2026-07-30.