Cloudanix VulnDB

CVE-2026-31838

Medium · 5.3

CVSS

5.3

EPSS

0.4%

Published

Mar 10, 2026

CISA due date

—

The record

Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a vulnerability in Envoy RBAC header matching could allow authorization policy bypass when policies rely on HTTP headers that may contain multiple values. An attacker could craft requests with multiple header values in a way that causes Envoy to evaluate the header differently than intended, potentially bypassing authorization checks. This may allow unauthorized requests to reach protected services when policies depend on such header-based matching conditions. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8.

Affected packages

Ecosystem Package Introduced Fixed

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