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Vulnerability record · CVE-2026-53713 · published 14 September 2026

CVE-2026-53713: Improper input validation vulnerability

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.

9.1 CVSS 3.1 Critical EPSS 0.43% · top 64.9% CWE-20 · Improper input validation Received
9.1CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
16 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

References

LinkTags
https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464
https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7
https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead
https://github.com/envoyproxy/gateway/pull/9171
https://github.com/envoyproxy/gateway/pull/9172
https://github.com/envoyproxy/gateway/pull/9173
https://github.com/envoyproxy/gateway/releases/tag/v1.7.4
https://github.com/envoyproxy/gateway/releases/tag/v1.8.1
https://github.com/envoyproxy/gateway/security/advisories/GHSA-wcrf-9vrr-854f

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Source: NIST National Vulnerability Database (record CVE-2026-53713), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.