CVE-2026-31838

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...

CVE-2026-31838

CVE-2026-31838 describes a vulnerability in Istio where an Envoy RBAC header matching could bypass authorization when policies rely on HTTP headers with multiple values. Affected are Istio deployments using Envoy before versions 1.29.1, 1.28.5, or 1.27.8. An attacker could craft requests with mul...