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CVE-2026-26308— Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation

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Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.37.1之前版本、1.36.5之前版本、1.35.8之前版本和1.34.13之前版本存在安全漏洞，该漏洞源于基于角色的访问控制过滤器在验证具有多个值的HTTP标头时存在逻辑漏洞，可能导致绕过拒绝规则。

CVSS 7.5 · High EPSS 0.34% · P26

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-26308

Vulnerability Information
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Vulnerability Title
Envoy has an RBAC Header Validation Bypass via Multi-Value Header Concatenation
Source: CVE Program / CVE List V5
Vulnerability Description
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the Envoy RBAC (Role-Based Access Control) filter contains a logic vulnerability in how it validates HTTP headers when multiple values are present for the same header name. Instead of validating each header value individually, Envoy concatenates all values into a single comma-separated string. This behavior allows attackers to bypass RBAC policies—specifically "Deny" rules—by sending duplicate headers, effectively obscuring the malicious value from exact-match mechanisms. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
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
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Envoy 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Envoy是Enphase开源的一款用于连接智能家居设备的网关程序。 Envoy 1.37.1之前版本、1.36.5之前版本、1.35.8之前版本和1.34.13之前版本存在安全漏洞，该漏洞源于基于角色的访问控制过滤器在验证具有多个值的HTTP标头时存在逻辑漏洞，可能导致绕过拒绝规则。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
envoyproxy envoy >= 1.37.0, < 1.37.1 -

II. Public POCs for CVE-2026-26308

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III. Intelligence Information for CVE-2026-26308

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Patches & Fixes for CVE-2026-26308 (1)

Vendor Advisories for CVE-2026-26308 (1)

Same Patch Batch · envoyproxy · 2026-03-10 · 5 CVEs total

CVE-2026-26310 5.9 MEDIUM Crash for scoped ip address in Envoy during DNS
CVE-2026-26311 5.9 MEDIUM Envoy HTTP: filter chain execution on reset streams causing UAF crash
CVE-2026-26309 5.3 MEDIUM Envoy has an off-by-one write in JsonEscaper::escapeString()
CVE-2026-26330 5.3 MEDIUM Envoy global rate limit may crash when the response phase limit is enabled and the respons

IV. Related Vulnerabilities

Same product: envoy
Same vendor: envoyproxy
Same weakness: CWE-863

V. Comments for CVE-2026-26308

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