Logic Vulnerability in Envoy Proxy's Role-Based Access Control
CVE-2026-26308

7.5HIGH

Key Information:

Vendor

Envoyproxy

Status
Envoy
Vendor
CVE Published:
10 March 2026

What is CVE-2026-26308?

Envoy, a high-performance edge service proxy, has a vulnerability in its Role-Based Access Control (RBAC) feature that relates to how it processes HTTP headers. Prior to versions 1.37.1, 1.36.5, 1.35.8, and 1.34.13, the RBAC filter did not validate multiple header values correctly. Instead of assessing each value separately, it combined them into a single string. This error allows adversaries to manipulate access control measures by sending duplicate headers, which can obscure harmful payloads from standard matching rules, thereby circumventing the intended security policies of Envoy's RBAC system.

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Affected Version(s)

envoy >= 1.37.0, < 1.37.1 < 1.37.0, 1.37.1

envoy >= 1.36.0, < 1.36.5 < 1.36.0, 1.36.5

envoy >= 1.35.0, < 1.35.9 < 1.35.0, 1.35.9

References

https://github.com/envoyproxy/envoy/security/advisories/G...
x_refsource_CONFIRM
https://github.com/envoyproxy/envoy/commit/b6ba0b2294b984...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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