CVE-2026-15738 | Incorrect behavior order in the Gateway API listener-rule ge… | CVSS 8.5 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.

Metadata

CVE ID: CVE-2026-15738
State: PUBLISHED
Assigner: AMZN
Reserved: 2026-07-14 14:02 UTC
Published: 2026-07-14 20:19 UTC
Last updated: 2026-07-14 20:19 UTC
Primary CWE: CWE-653
CWE-653 Improper isolation or compartmentalization
Vendor / Product: Amazon / aws-load-balancer-controller
Sources: cve.org · NVD

Severity & Metrics

8.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products (1)

Vendor	Product	Platform	Versions
Amazon	aws-load-balancer-controller	—	0 < 3.4.2

Weakness (CWE)

CWE	Source	Description
CWE-653	cna	CWE-653 Improper isolation or compartmentalization

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
5.8	MEDIUM	4.0	cna	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

References (2)