CVE-2026-26308

Published: Mar 10, 2026 Last Modified: Mar 11, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,5
Source: [email protected]
Attack Vector: network
Attack Complexity: high
Privileges Required: none
User Interaction: none
Scope: changed
Confidentiality: high
Integrity: low
Availability: none

Description

AI Translation Available

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.

EPSS (Exploit Prediction Scoring System)

Trend Analysis

EPSS (Exploit Prediction Scoring System)

Prevede la probabilità di sfruttamento basata su intelligence sulle minacce e sulle caratteristiche della vulnerabilità.

EPSS Score
0,0000
Percentile
0,0th
Updated

EPSS Score Trend (Last 7 Days)

863

Incorrect Authorization

Incomplete
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Integrity Access Control Availability
Potential Impacts:
Read Application Data Read Files Or Directories Modify Application Data Modify Files Or Directories Gain Privileges Or Assume Identity Bypass Protection Mechanism Execute Unauthorized Code Or Commands Dos: Crash, Exit, Or Restart Dos: Resource Consumption (Cpu) Dos: Resource Consumption (Memory) Dos: Resource Consumption (Other)
Applicable Platforms
Technologies: Database Server, Not Technology-Specific, Web Server
Likelihood of Exploit: High
View CWE Details
Application

Envoy by Envoyproxy

Product Information
Vendor Envoyproxy
Product Envoy
Version Range Affected
From 1.35.0 (inclusive)
To 1.35.8 (exclusive)
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Envoy by Envoyproxy

Product Information
Vendor Envoyproxy
Product Envoy
Version Range Affected
From 1.36.0 (inclusive)
To 1.36.5 (exclusive)
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Envoy by Envoyproxy

Product Information
Vendor Envoyproxy
Product Envoy
Version Range Affected
To 1.34.13 (exclusive)
cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
Application

Envoy by Envoyproxy

Product Information
Vendor Envoyproxy
Product Envoy
Version 1.37.0
cpe:2.3:a:envoyproxy:envoy:1.37.0:*:*:*:*:*:*:*
Common Platform Enumeration - Standardized vulnerability identification
https://github.com/envoyproxy/envoy/commit/b6ba0b2294b98484…
https://github.com/envoyproxy/envoy/commit/b6ba0b2294b98484fb0ed8556897d1073cc2…
https://github.com/envoyproxy/envoy/security/advisories/GHS…
https://github.com/envoyproxy/envoy/security/advisories/GHSA-ghc4-35x6-crw5