CVE-2026-15738: Amazon Aws-Load-Balancer-Controller

High severity, CVSS 8.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Incorrect behavior order in the Gateway API listener-rule generation in Amazon AWS Load Balancer Controller before 3.4.2 might allow an authenticated remote user to intercept, spoof, or deny another namespace's gRPC traffic on a shared Gateway via a crafted HTTPRoute resource. To mitigate this issue, users should upgrade to version 3.4.2.

Affected products

• Amazon Aws-Load-Balancer-Controller: before 3.4.2 (fixed in 3.4.2)

Published 2026-07-14. Last modified 2026-07-15.