TI-2026-13241 Aliases CVE-2026-15738

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

LOW 29CWE-653Published 2026-07-14 · Updated 2026-07-15

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00647 51st percentileScored 2026-11-07

Fix Fixed aws-load-balancer-controller (Amazon): 3.4.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
AWS	aws-load-balancer-controller	before 3.4.2	3.4.2	Patch available	CNA

aws-load-balancer-controller VendorAWS Affected before 3.4.2 Fixed in 3.4.2 Patch available CNA

Remediation

Fix · CNA aws-load-balancer-controller (Amazon) Fixed in 3.4.2

Timeline

2026-10-02 Threatist record created from CVE-2026-15738
2026-10-19 EPSS moved to the 50th–90th percentile

References

Advisory 1

https://aws.amazon.com/security/security-bulletins/2026-055-aws/

Other 1

https://github.com/kubernetes-sigs/aws-load-balancer-controller/releases/tag/v3.4.2

TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9

See all 383 →

Sources

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