CVE-2026-15738 MEDIUM

CVE-2026-15738: Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller

Vendor Amazon
Product aws-load-balancer-controller
Weakness CWE-653
Published July 14, 2026
Last update July 15, 2026
View on NVD All CVEs

CVSS base score

5.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 14, 2026 CVE published
July 15, 2026 Record updated