CVE-2025-46821

Envoy vulnerable to bypass of RBAC uri_template permission

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.

References

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

Frequently Asked Questions

What is the severity of CVE-2025-46821?: CVE-2025-46821 has been scored as a medium severity vulnerability.
How to fix CVE-2025-46821?: To fix CVE-2025-46821, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-46821 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-46821 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-46821?: CVE-2025-46821 affects envoyproxy envoy.

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Description

Category

CWE-186 – Overly Restrictive Regular Expression

References

Frequently Asked Questions