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CVE-2026-73553— Envoy: RBAC Authorization Bypass via Path Parameters

Quick assessment

Affected

envoyproxy envoy

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 是一个专为云原生应用设计的开源边缘和服务代理。在版本 1.36.10、1.37.6、1.38.4 和 1.39.1 之前，当启用了选项时，Envoy 的路由器会在匹配前剥离分号（;）后缀，但 RBAC 的匹配器却会对原始路径进行评估。因此，像这样的下游请求可以绕过针对的 DENY（拒绝）规则，而路由器仍会选择受保护的后端服务。这种规范化处理的不一致性使得未经身份验证的客户端能够绕过基于路径的授权控制。该漏洞的触发边界条件是：必须同时存在路由选项和基于路径的 RBAC 规则，并且受保护的路由

CVSS 7.5 · High EPSS 0.51% · P44 Updated Sep 23, 2026

Possible ATT&CK Techniques 1 AI

T1558 · Steal or Forge Kerberos Tickets

Affected Version Matrix 4

Vendor	Product	Version Range	Status
envoyproxy	envoy	`< 1.36.10`	affected
		`>= 1.37.0, < 1.37.6`	affected
		`>= 1.38.0, < 1.38.4`	affected
		`>= 1.39.0, < 1.39.1`	affected

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Vulnerability Information

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Vulnerability Title

Envoy: RBAC Authorization Bypass via Path Parameters

Source: CVE Program / CVE List V5

Vulnerability Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, When ignore_path_parameters_in_path_matching is enabled, Envoy's router strips the semicolon suffix before matching but the RBAC url_path matcher evaluates the raw path. A downstream request such as /admin;x can therefore miss a DENY rule for /admin while the router still selects the protected /admin backend. The inconsistent canonicalization allows an unauthenticated client to bypass path-based authorization. The relevant scope boundary is that the route option and a path-based RBAC rule must both be present, and the protected route must match after stripping. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

解释冲突

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
envoyproxy	envoy	< 1.36.10	-

II. Public POCs for CVE-2026-73553

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-73553

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Patches & Fixes for CVE-2026-73553 (4)

🔗 Fix RBAC bypass via path parameters · envoyproxy/envoy@0be4a03 · GitHub Read full article x_refsource_MISC
🔗 Fix RBAC bypass via path parameters · envoyproxy/envoy@b6ec9b6 · GitHub Read full article x_refsource_MISC
🔗 Fix RBAC bypass via path parameters · envoyproxy/envoy@e6d5fe8 · GitHub Read full article x_refsource_MISC
🔗 Fix RBAC bypass via path parameters · envoyproxy/envoy@6a703a3 · GitHub Read full article x_refsource_MISC

Other References for CVE-2026-73553 (5)

🔗 Release v1.38.4 · envoyproxy/envoy · GitHub Read full article x_refsource_MISC
🔗 Release v1.37.6 · envoyproxy/envoy · GitHub Read full article x_refsource_MISC
🔗 Release v1.39.1 · envoyproxy/envoy · GitHub Read full article x_refsource_MISC
🔗 Release v1.36.10 · envoyproxy/envoy · GitHub Read full article x_refsource_MISC
🔗 Path Parameter Canonicalization Bypasses Path-Based Security Rules · Advisory · envoyproxy/envoy · GitHub Read full article x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2026-73553

Same Patch Batch · envoyproxy · 2026-09-21 · 13 CVEs total

CVE-2026-73550	7.5 HIGH	Envoy: HTTP/2 Discarded Host Header 200 GB Header-Copy OOM in Envoy
CVE-2026-73512	7.5 HIGH	Envoy: use-after-free in QUIC on internal redirects
CVE-2026-73513	7.5 HIGH	Envoy: oghttp2 upstream trailers incorrect handling
CVE-2026-73548	7.5 HIGH	Envoy: Cross-user response poisoning via a generic (non-WebSocket) HTTP upgrade on Envoy's
CVE-2026-73547	7.5 HIGH	Envoy ext_authz: request `:path` pseudoheader dereferenced w/o null check
CVE-2026-73552	7.5 HIGH	Envoy: HTTP RBAC safe_regex can fail open on RFC-valid obs-text header values
CVE-2026-73546	7.4 HIGH	Envoy: Stored XSS in Admin Stats Interface (/stats?format=html)
CVE-2026-48521	5.9 MEDIUM	Envoy: HTTP/3 connection pool selection null-derefs in ProdClusterManagerFactory::allocate
CVE-2026-50572	5.9 MEDIUM	Envoy: ext_authz - RawHttpClientImpl onSuccess 0x0 segfault
CVE-2026-73511	5.3 MEDIUM	Envoy: Potential path-matching/authentication bypass when using Envoy in combination with
CVE-2026-73549	5.3 MEDIUM	Envoy - Incomplete fix for CVE-2026-26310: copyInternetAddressAndPort crashes on scoped IP
CVE-2026-73551	5.3 MEDIUM	Envoy: Path normalization does not handle dot and dotdot segments with parameters

IV. Related Vulnerabilities

Same product: envoy

Same vendor: envoyproxy

Same weakness: CWE-436