CVE-2026-15738

HIGHPre-NVD 8.58.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.5
EG Score
8.5(medium)
EPSS
29.5%
KEV
Not listed

Published

July 14, 2026

Last Modified

July 15, 2026

Advisory Details (2)

Auto-updated Jul 14, 2026
Patch available. Sources: github_release.
github_release Patch Available

v3.4.2

Patch available: kubernetes-sigs/aws-load-balancer-controller v3.4.2

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

CVE-2026-15738 - Issue with AWS Load Balancer Controller Cross-Namespace Traffic Interception via HTTPRoute/GRPCRoute Priority Ordering

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

Vendor Advisories for CVE-2026-15738(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 5× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 19:08 UTCEG score recompute
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 07:49 UTCEG score recompute
  4. 2026-07-14 20:31 UTCEG score recompute
  5. 2026-07-14 20:30 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-15738?
CVE-2026-15738 is a high vulnerability published on July 14, 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…
When was CVE-2026-15738 disclosed?
CVE-2026-15738 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15738 actively exploited?
CVE-2026-15738 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-15738?
CVE-2026-15738 has a CVSS v3 base score of 8.5 (NVD).
How do I remediate CVE-2026-15738?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15738, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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