Vulnerability · Published Jul 14, 2026 · Assigned by AMZN
CVE-2026-15738Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller
High 8.5
In plain English
A high-severity security flaw in aws-load-balancer-controller from Amazon. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).
Severity (CVSS 3.1)8.5High
Exploit odds (30 days)0.6%top 48.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Amazon | aws-load-balancer-controller | 0 – before 3.4.2 |
Weakness: CWE-653 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H