Envoy Gateway: Authentication Bypass via Improper Input Validation in EnvoyExtensionPolicy Lua Allows Secret Disclosure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53713
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-14 21:17:12 UTC
Updated2026-09-30 17:43:24 UTC
DescriptionEnvoy 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

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

EPSS: 0.004330000 probability, percentile 0.353210000 (date 2026-10-02)

Problem Types: CWE-20 | CWE-20 CWE-20: Improper Input Validation

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Envoyproxy Gateway affected < 1.7.4 Not specified
CNA Envoyproxy Gateway affected >= 1.8.0-rc.0, < 1.8.1 Not specified

References

ReferenceSourceLinkTags
github.com/envoyproxy/gateway/releases/tag/v1.8.1 [email protected] github.com
github.com/envoyproxy/gateway/pull/9173 [email protected] github.com
github.com/envoyproxy/gateway/pull/9172 [email protected] github.com
github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf2... [email protected] github.com
github.com/envoyproxy/gateway/releases/tag/v1.7.4 [email protected] github.com
github.com/envoyproxy/gateway/security/advisories/GHSA-wcrf-9vrr-854f [email protected] github.com
github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb015... [email protected] github.com
github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c5095289203... [email protected] github.com
github.com/envoyproxy/gateway/pull/9171 [email protected] github.com
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