CVE-2026-15738 PUBLISHED

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

Assigner: AMZN
Reserved: 14.07.2026 Published: 14.07.2026 Updated: 15.07.2026

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.

CVSS 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
CVSS Score: 5.8

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	High
Attack Complexity	Low	Integrity	None	Integrity	High
Attack Requirements	Present	Availability	None	Availability	High
Privileges Required	Low
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS Score: 8.5

Attack Vector	Network	Scope	Changed
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	Amazon
Product	aws-load-balancer-controller
Versions	Default: unaffected affected from 0 to 3.4.2 (excl.)

CVE-2026-15738 PUBLISHED

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

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Product Status

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