CVE-2026-73553

HIGH 7.5

Envoy: RBAC Authorization Bypass via Path Parameters

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, When ignore_path_parameters_in_path_matching is enabled, Envoy's router strips the semicolon suffix before matching but the RBAC url_path matcher evaluates the raw path. A downstream request such as /admin;x can therefore miss a DENY rule for /admin while the router still selects the protected /admin backend. The inconsistent canonicalization allows an unauthenticated client to bypass path-based authorization. The relevant scope boundary is that the route option and a path-based RBAC rule must both be present, and the protected route must match after stripping. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

CWE	CWE-436
Vendor	envoyproxy
Product	envoy
Published	Sep 21, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

envoyproxy / envoy

< 1.36.10 >= 1.37.0, < 1.37.6 >= 1.38.0, < 1.38.4 >= 1.39.0, < 1.39.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗