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TI-2026-47431 Aliases CVE-2026-66787GHSA-7fh9-j94v-w42j

Lighthouse: lighthouse: cross-cluster dns spoofing via unvalidated endpointslice ip addresses

Priority LOW 39CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-345.

Summary

A flaw was found in the lighthouse component of Red Hat Advanced Cluster Management for Kubernetes. This vulnerability stems from insufficient validation of advertised IP addresses within EndpointSlice objects. A compromised spoke cluster can exploit this by creating EndpointSlices with attacker-controlled IP addresses, causing other clusters' lighthouse DNS to redirect legitimate service traffic to malicious endpoints. This enables a remote attacker to conduct transparent Man-in-the-Middle (MITM) attacks on cross-cluster service communications, potentially leading to unauthorized information disclosure and data manipulation.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00298 22nd percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories

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

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16—1790670439Patch availableCNA
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16—1790670231Patch availableCNA
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16—1790670243Patch availableCNA
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16—1790670912Patch availableCNA
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.17—1788023916Patch availableCNA
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.17—1788023940Patch availableCNA
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.17—1788105072Patch availableCNA
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.17—1788073481Patch availableCNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 VendorRed Hat Affected — Fixed in 1790670439 Patch available CNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 VendorRed Hat Affected — Fixed in 1790670231 Patch available CNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 VendorRed Hat Affected — Fixed in 1790670243 Patch available CNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.16 VendorRed Hat Affected — Fixed in 1790670912 Patch available CNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 VendorRed Hat Affected — Fixed in 1788023916 Patch available CNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 VendorRed Hat Affected — Fixed in 1788023940 Patch available CNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 VendorRed Hat Affected — Fixed in 1788105072 Patch available CNA
  • Red Hat Advanced Cluster Management for Kubernetes 2.17 VendorRed Hat Affected — Fixed in 1788073481 Patch available CNA

CPE names CNA · 2

CPEVersionsRoleVendor
cpe:/a:redhat:acm:2.16::el92.16—Red Hat
cpe:/a:redhat:acm:2.17::el92.17—Red Hat
  • cpe:/a:redhat:acm:2.16::el9 Versions 2.16 — ·Red Hat
  • cpe:/a:redhat:acm:2.17::el9 Versions 2.17 — ·Red Hat

Remediation

Red Hat 2 advisories

  • RHSA-2026:85227 Released 2026-10-19 · Red Hat rating Important
    Submariner v0.23 security fixes and container updates
    • Red Hat Advanced Cluster Management for Kubernetes 2.16 registry.redhat.io/rhacm2/lighthouse-agent-rhel9, registry.redhat.io/rhacm2/lighthouse-coredns-rhel9, registry.redhat.io/rhacm2/subctl-rhel9 +4
  • RHSA-2026:63016 Released 2026-09-03 · Red Hat rating Important
    Submariner v0.24 security fixes and container updates
    • Red Hat Advanced Cluster Management for Kubernetes 2.17 registry.redhat.io/rhacm2/lighthouse-agent-rhel9, registry.redhat.io/rhacm2/lighthouse-coredns-rhel9, registry.redhat.io/rhacm2/subctl-rhel9 +4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Red Hat Advanced Cluster Management for Kubernetes 2.16, Red Hat Advanced Cluster Management for Kubernetes 2.17 — RHSA-2026:63016

    7 records Highest priority Priority MEDIUM 1 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2026-47432 Lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker labelPriority MEDIUM 44
    • TI-2026-47429 Submariner: submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijackPriority LOW 39
    • TI-2026-47425 Submariner-operator: broker serviceaccount secret (token + ca) logged in full at trace verbosityPriority LOW 32
    Show all 7 records → Advisory →
  • Advisory ·

    Red Hat Advanced Cluster Management for Kubernetes 2.16, Red Hat Advanced Cluster Management for Kubernetes 2.17 — RHSA-2026:85227

    7 records Highest priority Priority MEDIUM 1 MEDIUM, 6 LOW

    Other records, highest priority first

    • TI-2026-47432 Lighthouse: lighthouse: arbitrary namespace injection via attacker-controlled broker labelPriority MEDIUM 44
    • TI-2026-47429 Submariner: submariner: missing validation of remote endpoint subnets and clusterid enables cross-cluster traffic hijackPriority LOW 39
    • TI-2026-47425 Submariner-operator: broker serviceaccount secret (token + ca) logged in full at trace verbosityPriority LOW 32
    Show all 7 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Advanced Cluster Management for Kubernetes 2.16Fixed RHSA-2026:85227
Red Hat Advanced Cluster Management for Kubernetes 2.17Fixed RHSA-2026:63016
Not affected: 2 products
  • Red Hat Advanced Cluster Management for Kubernetes 2.16
  • Red Hat Advanced Cluster Management for Kubernetes 2.17

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-66787
  2. 2026-10-03 Alias added: GHSA-7fh9-j94v-w42j
  3. 2026-10-12 Title updated · CNA
  4. 2026-10-12 CVSS score changed · CNA
  5. 2026-10-12 Weakness changed · CNA
  6. 2026-10-12 Priority changed: LOW → MEDIUM
  7. 2026-10-13 CVSS score changed · Red Hat
  8. 2026-10-13 Priority changed: MEDIUM → LOW
  9. 2026-10-19 Fix available: rhacm2/lighthouse-agent-rhel9@1790670439, rhacm2/lighthouse-coredns-rhel9@1790670231, rhacm2/subctl-rhel9@1790670243 +1 · CNA
  10. 2026-10-19 1 new reference · CNA
  11. 2026-10-20 Fix available: RHSA-2026:85227 · Red Hat
  12. 2026-10-20 Fix available: Red Hat Advanced Cluster Management for Kubernetes 2.16 · Red Hat

References

Advisory 2

Other 2

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7412 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences