What is CVE-2026-15738?

CVE-2026-15738 is a high-severity vulnerability in Amazon Aws-Load-Balancer-Controller, classified under CWE-653. CVSS score: 8.5/10. Published 2026-07-14.

How severe is CVE-2026-15738?

High severity. CVSS v3 base score is 8.5 out of 10.

Vulnerability in Amazon Aws-Load-Balancer-Controller

CVE-2026-15738

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.

EPSS: 0.006 (48.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Amazon Aws-load-balancer-controller — versions 0

Weakness classification (CWE)

CWE-653

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (release-notes)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)

Frequently asked questions

What is CVE-2026-15738?: CVE-2026-15738 is a high-severity vulnerability in Amazon Aws-Load-Balancer-Controller, classified under CWE-653. CVSS score: 8.5/10. Published 2026-07-14.
How severe is CVE-2026-15738?: High severity. CVSS v3 base score is 8.5 out of 10.