CVE-2026-66754 | Rouille 0.1.6 through 3.6.2 contains a reachable assertion v… | CVSS 5.9 MEDIUM

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.

Metadata

CVE ID: CVE-2026-66754
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-27 16:27 UTC
Published: 2026-07-28 16:04 UTC
Last updated: 2026-07-28 16:18 UTC
Primary CWE: CWE-617
Reachable Assertion
Vendor / Product: tomaka / rouille
Sources: cve.org · NVD

Severity & Metrics

5.9 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products (1)

Vendor	Product	Platform	Versions
tomaka	rouille	—	0.1.6 ≤ 3.6.2

Weakness (CWE)

CWE	Source	Description
CWE-617	cna	Reachable Assertion

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.2	HIGH	4.0	cna	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
5.9	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References (2)