Vulnerability · Published Sep 14, 2026 · Assigned by GitHub_M
CVE-2026-53713Envoy Gateway: Authentication Bypass via Improper Input Validation in EnvoyExtensionPolicy Lua Allows Secret Disclosure
Critical 9.1
In plain English
A critical-severity improper input validation in gateway from envoyproxy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.7.4 and 1.8.1, to_absolute_normalized_path in internal/gatewayapi/luavalidator/security.lua does not collapse redundant separators before is_critical_path evaluates Lua submitted through EnvoyExtensionPolicy during default Strict validation. Linux resolves a double-slash absolute path as the corresponding single-slash path, but the validator does not match the redundant-separator form, allowing submitted Lua to read arbitrary files from the gateway controller pod. Exposed files can include Kubernetes service-account tokens, TLS certificates, and process environment data, and the disclosed credentials can provide access to sensitive Kubernetes API Server or Gateway xDS server information. This issue is fixed in versions 1.7.4 and 1.8.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/envoyproxy/gateway | 1.8.1 | GHSA-wcrf-9vrr-854f |
| Go | github.com/envoyproxy/gateway | 1.7.4 | GHSA-wcrf-9vrr-854f |
| Go | github.com/envoyproxy/gateway | 1.7.4, 1.8.1 | GO-2026-6011 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| envoyproxy | gateway | < 1.7.4>= 1.8.0-rc.0, < 1.8.1 |
Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
References
- https://github.com/envoyproxy/gateway/security/advisories/GHSA-wcrf-9vrr-854f x_refsource_CONFIRM
- https://github.com/envoyproxy/gateway/pull/9171 x_refsource_MISC
- https://github.com/envoyproxy/gateway/pull/9172 x_refsource_MISC
- https://github.com/envoyproxy/gateway/pull/9173 x_refsource_MISC
- https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464 x_refsource_MISC
- https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7 x_refsource_MISC
- https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead x_refsource_MISC
- https://github.com/envoyproxy/gateway/releases/tag/v1.7.4 x_refsource_MISC
- https://github.com/envoyproxy/gateway/releases/tag/v1.8.1 x_refsource_MISC