CVE-2026-15738

High

Description

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.

SeverityHigh

CVSS8.5

Exploit probability—

ProductAmazon Aws-load-balancer-controller

PublishedJul 14, 2026

First seenJul 14, 2026

Weakness typeCWE-653CWE-653

How to fix

Update

Amazon aws-load-balancer-controller3.4.2 or later

Vendor advisories

github.com/kubernetes-sigs/aws-load-balancer-controller/releases/tag/v3.4.2
aws.amazon.com/security/security-bulletins/2026-055-aws/

Affected products

Product	Affected versions	Fixed in
Amazon aws-load-balancer-controller	v < 3.4.2	3.4.2

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