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CVE-2026-15738 - Issue with AWS Load Balancer Controller Cross-Namespace Traffic Interception via HTTPRoute/GRPCRoute Priority OrderingCVE-2026-15738 0 CVE-2026-15738 is a vulnerability in the AWS Load Balancer Controller affecting versions including v3.4.1 and those supporting both HTTPRoute and GRPCRoute on the same ALB HTTPS listener. The issue arises from incorrect rule precedence ordering where HTTPRoute rules receive higher priority than more specific GRPCRoute rules, allowing a namespace-scoped user to create a catch-all HTTPRoute that intercepts traffic meant for GRPCRoutes in other namespaces. This can lead to cross-namespace traffic interception. The vulnerability has been fixed in version 3.4.2. Workarounds include restricting AllowedRoutes.Namespaces.From to Same or applying namespace selectors to limit route attachments to trusted namespaces. Join the discussion | AWS Security Bulletins | 07/14/2026, 20:24:29 UTC Added: 07/14/2026, 20:30:34 UTC |
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