CVE-2026-66754 – Rouille 0.1.6 – 3.6.2 Reachable Assertion DoS via remove_prefix percent-encoding

CVE ID :CVE-2026-66754

Published : July 28, 2026, 4:20 p.m. | 20 minutes ago

Description :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.

Severity: 8.2 | HIGH

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