CVE-2026-15738

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

Published Jul 14, 2026 CVSS 4.0 · 5.8 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Cross-namespace traffic interception via incorrect route precedence ordering in AWS Load Balancer Controller
First Time appeared Amazon
Amazon aws-load-balancer-controller
Weaknesses CWE-653
CPEs cpe:2.3:a:amazon:aws-load-balancer-controller:*:*:*:*:*:*:*:*
Vendors & Products Amazon
Amazon aws-load-balancer-controller
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 5.8, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMZN
Published
Updated
Jul 15, 2026, 1:01 PM
Reserved
Jul 14, 2026, 2:02 PM
Status
Awaiting Analysis
Published
Jul 14, 2026, 9:16 PM
Modified
Oct 24, 2026, 9:10 PM