Incorrect Regular Expression in envoy - CVE-2025-46821
Published: December 3, 2025
Vulnerability identifier: #VU119109
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-46821
CWE-ID: CWE-185
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cloud Native Computing Foundation
Affected software:
envoy
envoy
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient input validation within the template matcher that incorrectly excludes the "*" character from a set of valid characters in the URI path. A remote attacker can bypass RBAC rules when configured using the uri_template permissions.
How to mitigate CVE-2025-46821
Install updates from vendor's website.