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CVE-2026-66754

HighPublished

Rouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encoding

Published: Jul 28, 2026
Updated: Jul 29, 2026
Assigning CNA: VulnCheck
Evidence observed: Aug 5, 2026

Primary CVSS

8.2/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 34.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-66754-Remote-Denial-of-Service-via-Reachable-Assertion-in-URL-Prefix-Handling-rouille-Research
Security Advisory: Remote Denial of Service via Reachable Assertion in URL Prefix Handling (rouille)

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