CVE-2025-46821

Envoy vulnerable to bypass of RBAC uri_template permission

State: Published
Severity: 5.3 Medium
Published: May 7, 2025
Updated: May 8, 2025
Reserved: Apr 30, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-186 Overly Restrictive Regular Expression

Affected Products

Product	Versions
envoyenvoyproxy	< 1.31.8Affected >= 1.32.0, < 1.32.6Affected >= 1.33.0, < 1.33.3Affected >= 1.34.0, < 1.34.1Affected

References

https://github.com/envoyproxy/envoy/security/advisories/GHSA-c7cm-838g-6g67

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