Overly Restrictive Regular Expression Affecting envoyproxy/envoy package, versions [,1.31.8)[1.32.0,1.32.6)[1.33.0,1.33.3)[1.34.0,1.34.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-ENVOYPROXYENVOY-10292121
- published2 Jun 2025
- disclosed7 May 2025
- creditBartosz Chwila
Introduced: 7 May 2025
CVE-2025-46821 (opens in a new tab)How to fix?
Upgrade envoyproxy/envoy to version 1.31.8, 1.32.6, 1.33.3, 1.34.1 or higher.
Overview
Affected versions of this package are vulnerable to Overly Restrictive Regular Expression due to the incorrect exclusion of the * character in the URI path matcher. An attacker can bypass RBAC rules by crafting a URI path that includes the * character.
Note:
This is only exploitable if RBAC rules are configured using the uri_template permissions.
Workaround
This vulnerability can be mitigated by configuring additional RBAC permissions using url_path with safe_regex expression.