CVE-2026-15738 | THREATINT

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.

PUBLISHED Reserved 2026-07-14 | Published 2026-07-14 | Updated 2026-07-14 | Assigner AMZN

MEDIUM: 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

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

Problem types

CWE-653 Improper isolation or compartmentalization

Product status

Default status

unaffected

Any version before 3.4.2

affected

References

github.com/...s-load-balancer-controller/releases/tag/v3.4.2 release-notes

aws.amazon.com/security/security-bulletins/2026-055-aws/ vendor-advisory

cve.org (CVE-2026-15738)

nvd.nist.gov (CVE-2026-15738)

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