Incorrect Behavior Order: Authorization Before Parsing and Canonicalization Affecting openshift-service-mesh/pilot-rhel8 package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.21% (12th percentile)

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  • Snyk IDSNYK-RHEL8-OPENSHIFTSERVICEMESHPILOTRHEL8-15523626
  • published13 Mar 2026
  • disclosed10 Mar 2026

Introduced: 10 Mar 2026

CVE-2026-31838  (opens in a new tab)
CWE-551  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 openshift-service-mesh/pilot-rhel8.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openshift-service-mesh/pilot-rhel8 package and not the openshift-service-mesh/pilot-rhel8 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1