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.

CVSS 4.0

5.8CVSS: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 3.1

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

EPSS

0.6% chance of exploitation in the next 30 days; higher than 50% of CVEs (scores of 2026-10-25)

CWE

CWE-653

Published

2026-07-14

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

References

• https://aws.amazon.com/security/security-bulletins/2026-055-aws/
• https://github.com/kubernetes-sigs/aws-load-balancer-controller/releases/tag/v3.4.2

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