CVE-2026-15738CWE-653

Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller

Medium · published July 14, 2026

CVSS v4.0
5.8
EPSS
1%
Percentile
50.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.8 · MEDIUM
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
EPSS
0.00647 · 50.4th percentile
Weakness
CWE-653 · Improper Isolation or Compartmentalization
Published
2026-07-14T20:19Z
EPSS history
Timeline
  • 14 JUL 20:19Z
    Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller
    cvelistv5