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CVE-2026-53713— Envoy Gateway: Authentication Bypass via Improper Input Validation in EnvoyExtensionPolicy Lua Allows Secret Disclosure

Quick assessment

Affected
envoyproxy gateway
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Envoy Gateway 是一个开源项目，用于将 Envoy Proxy 作为独立应用程序网关或基于 Kubernetes 的应用程序网关进行管理。在 1.7.4 和 1.8.1 版本之前， 中的 函数在 评估通过 提交的 Lua 代码之前，未能消除冗余的路径分隔符（例如双斜杠 ）。在 Linux 系统中，带有双斜杠的绝对路径会被解析为对应的单斜杠路径，但该验证器未能匹配这种包含冗余分隔符的路径形式，从而使得提交的 Lua 代码能够读取网关控制器 Pod 中的任意文件。 被暴露的文件可能包括 Kubernetes

CVSS 9.1 · Critical EPSS 0.04% · P13

Possible ATT&CK Techniques 2 AI

T1019 T1083.004
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I. Basic Information for CVE-2026-53713

Vulnerability Information
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Vulnerability Title
Envoy Gateway: Authentication Bypass via Improper Input Validation in EnvoyExtensionPolicy Lua Allows Secret Disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy gateway < 1.7.4 -

II. Public POCs for CVE-2026-53713

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III. Intelligence Information for CVE-2026-53713

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Patches & Fixes for CVE-2026-53713 (3)

Vendor Advisories for CVE-2026-53713 (1)

Vendor Pages for CVE-2026-53713 (2)

Same Patch Batch · envoyproxy · 2026-09-14 · 7 CVEs total

CVE-2026-53714 7.4 HIGH Envoy Gateway: xDS Control Plane Information Disclosure when Envoy Gateway operates in Gat
CVE-2026-53716 6.5 MEDIUM Envoy Gateway: Wasm HTTP fetch decompresses gzip without output-size limit
CVE-2026-53719 6.5 MEDIUM Envoy Gateway: Nil-dereference when SecurityPolicy targets TCPRoute without spec.authoriza
CVE-2026-53717 6.5 MEDIUM Envoy Gateway: OCI layer extraction allocates make([]byte, h.Size) from untrusted tar head
CVE-2026-53718 6.4 MEDIUM Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass
CVE-2026-53715 5.3 MEDIUM Envoy Gateway: Wasm cache ServeHTTP reads mappingPath2Cache without lock

IV. Related Vulnerabilities

Same product: gateway
Same vendor: envoyproxy
Same weakness: CWE-20

V. Comments for CVE-2026-53713

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