CVE-2025-46821: Envoyproxy Envoy

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Envoy is a cloud-native edge/middle/service proxy. Prior to versions 1.34.1, 1.33.3, 1.32.6, and 1.31.8, Envoy's URI template matcher incorrectly excludes the `*` character from a set of valid characters in the URI path. As a result URI path containing the `*` character will not match a URI template expressions. This can result in bypass of RBAC rules when configured using the `uri_template` permissions. This vulnerability is fixed in Envoy versions v1.34.1, v1.33.3, v1.32.6, v1.31.8. As a workaround, configure additional RBAC permissions using `url_path` with `safe_regex` expression.

Affected products

• Envoyproxy Envoy: before 1.31.8 (fixed in 1.31.8); from 1.32.0, before 1.32.6 (fixed in 1.32.6); from 1.33.0, before 1.33.3 (fixed in 1.33.3); version 1.34.0 only

Published 2025-05-07. Last modified 2026-06-17.