CVE-2026-66788

CRITICALPre-NVD 3.79.9▲
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-20. A secondary CVSS source baseline 3.7; sources differ by 6.2.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 3.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in Lighthouse. A remote attacker, by compromising a spoke cluster, can exploit a vulnerability where the destination namespace for resource injection is derived from an attacker-controlled label or annotation on the broker object. This allows the attacker to inject unauthorized EndpointSlices and ServiceImports into any namespace on peer clusters, including critical system namespaces like kube-system and openshift-*. This could lead to privilege escalation or other forms of system compromise within the cluster.

CVSS v3
3.7
EG Score
9.9CRITICALmedium confidence
EG Risk
45
EG Risk 45/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity99% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
36th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 3, 2026

Advisory Details (2)

Auto-updated Aug 28, 2026
Patch available. Sources: redhat.
redhat

2507533 – (CVE-2026-66788) CVE-2026-66788 lighthouse: lighthouse: arbitrary local-namespace injection via attacker-controlled LabelSourceNamespace

https://bugzilla.redhat.com/show_bug.cgi?id=2507533
redhat Patch Available

CVE-2026-66788 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-66788

Vendor Advisories for CVE-2026-66788(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhacm2/submariner-rhel9-operator:17880734812026-09-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 68× in last 7d / 325× 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.

Showing the most recent 100 of 462 total refreshes for this CVE.

  1. 2026-10-05 14:45 UTCVendor advisory
  2. 2026-10-05 14:45 UTCGHSA enrichment
  3. 2026-10-05 10:22 UTCVendor advisory
  4. 2026-10-05 10:22 UTCGHSA enrichment
  5. 2026-10-05 05:58 UTCVendor advisory
  6. 2026-10-05 05:58 UTCGHSA enrichment
  7. 2026-10-05 01:34 UTCEG score recompute
  8. 2026-10-05 01:34 UTCVendor advisory
  9. 2026-10-05 01:34 UTCGHSA enrichment
  10. 2026-10-04 23:22 UTCEPSS rescore
  11. 2026-10-04 20:52 UTCVendor advisory
  12. 2026-10-04 20:52 UTCGHSA enrichment
  13. 2026-10-04 16:02 UTCVendor advisory
  14. 2026-10-04 16:02 UTCGHSA enrichment
  15. 2026-10-04 11:28 UTCVendor advisory
  16. 2026-10-04 11:27 UTCGHSA enrichment
  17. 2026-10-04 07:02 UTCVendor advisory
  18. 2026-10-04 07:02 UTCGHSA enrichment
  19. 2026-10-04 02:39 UTCVendor advisory
  20. 2026-10-04 02:39 UTCGHSA enrichment
  21. 2026-10-03 21:10 UTCVendor advisory
  22. 2026-10-03 21:10 UTCGHSA enrichment
  23. 2026-10-03 16:47 UTCEG score recompute
  24. 2026-10-03 16:47 UTCVendor advisory
  25. 2026-10-03 16:47 UTCGHSA enrichment
Show 75 more
  1. 2026-10-03 14:26 UTCEPSS rescore
  2. 2026-10-03 06:37 UTCVendor advisory
  3. 2026-10-03 06:37 UTCGHSA enrichment
  4. 2026-10-03 01:36 UTCVendor advisory
  5. 2026-10-03 01:36 UTCGHSA enrichment
  6. 2026-10-02 21:00 UTCEG score recompute
  7. 2026-10-02 21:00 UTCVendor advisory
  8. 2026-10-02 21:00 UTCGHSA enrichment
  9. 2026-10-02 17:56 UTCEPSS rescore
  10. 2026-10-02 15:38 UTCVendor advisory
  11. 2026-10-02 15:38 UTCGHSA enrichment
  12. 2026-10-02 11:13 UTCVendor advisory
  13. 2026-10-02 11:13 UTCGHSA enrichment
  14. 2026-10-02 06:49 UTCVendor advisory
  15. 2026-10-02 06:49 UTCGHSA enrichment
  16. 2026-10-02 01:55 UTCVendor advisory
  17. 2026-10-02 01:55 UTCGHSA enrichment
  18. 2026-10-01 21:28 UTCEG score recompute
  19. 2026-10-01 21:28 UTCVendor advisory
  20. 2026-10-01 21:28 UTCGHSA enrichment
  21. 2026-10-01 19:50 UTCEPSS rescore
  22. 2026-10-01 14:28 UTCVendor advisory
  23. 2026-10-01 14:28 UTCGHSA enrichment
  24. 2026-10-01 10:05 UTCVendor advisory
  25. 2026-10-01 10:05 UTCGHSA enrichment
  26. 2026-10-01 05:41 UTCVendor advisory
  27. 2026-10-01 05:41 UTCGHSA enrichment
  28. 2026-10-01 01:13 UTCVendor advisory
  29. 2026-10-01 01:12 UTCGHSA enrichment
  30. 2026-09-30 20:31 UTCEG score recompute
  31. 2026-09-30 20:31 UTCVendor advisory
  32. 2026-09-30 20:31 UTCGHSA enrichment
  33. 2026-09-30 15:03 UTCEPSS rescore
  34. 2026-09-30 08:12 UTCEG score recompute
  35. 2026-09-30 08:12 UTCVendor advisory
  36. 2026-09-30 08:12 UTCGHSA enrichment
  37. 2026-09-29 06:25 UTCVendor advisory
  38. 2026-09-29 06:25 UTCGHSA enrichment
  39. 2026-09-29 02:02 UTCVendor advisory
  40. 2026-09-29 02:02 UTCGHSA enrichment
  41. 2026-09-28 21:38 UTCEG score recompute
  42. 2026-09-28 21:38 UTCVendor advisory
  43. 2026-09-28 21:38 UTCGHSA enrichment
  44. 2026-09-28 14:37 UTCEG score recompute
  45. 2026-09-28 14:37 UTCVendor advisory
  46. 2026-09-28 14:37 UTCGHSA enrichment
  47. 2026-09-28 13:52 UTCEPSS rescore
  48. 2026-09-28 10:08 UTCVendor advisory
  49. 2026-09-28 10:08 UTCGHSA enrichment
  50. 2026-09-28 05:38 UTCVendor advisory
  51. 2026-09-28 05:38 UTCGHSA enrichment
  52. 2026-09-28 01:14 UTCVendor advisory
  53. 2026-09-28 01:14 UTCGHSA enrichment
  54. 2026-09-27 20:50 UTCVendor advisory
  55. 2026-09-27 20:50 UTCGHSA enrichment
  56. 2026-09-27 16:27 UTCEG score recompute
  57. 2026-09-27 16:27 UTCVendor advisory
  58. 2026-09-27 16:27 UTCGHSA enrichment
  59. 2026-09-27 13:48 UTCEPSS rescore
  60. 2026-09-27 12:03 UTCVendor advisory
  61. 2026-09-27 12:03 UTCGHSA enrichment
  62. 2026-09-27 07:35 UTCVendor advisory
  63. 2026-09-27 07:35 UTCGHSA enrichment
  64. 2026-09-27 02:59 UTCEG score recompute
  65. 2026-09-27 02:59 UTCVendor advisory
  66. 2026-09-27 02:59 UTCGHSA enrichment
  67. 2026-09-26 15:59 UTCEPSS rescore
  68. 2026-09-25 09:30 UTCVendor advisory
  69. 2026-09-25 09:29 UTCGHSA enrichment
  70. 2026-09-25 05:05 UTCVendor advisory
  71. 2026-09-25 05:05 UTCGHSA enrichment
  72. 2026-09-25 00:41 UTCVendor advisory
  73. 2026-09-25 00:41 UTCGHSA enrichment
  74. 2026-09-24 19:06 UTCEG score recompute
  75. 2026-09-24 19:06 UTCVendor advisory

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Frequently asked(5)

What is CVE-2026-66788?
CVE-2026-66788 is a critical vulnerability published on August 20, 2026. A flaw was found in Lighthouse. A remote attacker, by compromising a spoke cluster, can exploit a vulnerability where the destination namespace for resource injection is derived from an attacker-controlled label or annotation on the broker object. This allows the attacker to inject unauthorized…
When was CVE-2026-66788 disclosed?
CVE-2026-66788 was first published on August 20, 2026, with the most recent update on September 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66788 actively exploited?
CVE-2026-66788 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66788?
CVE-2026-66788 has a CVSS base score of 3.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.9 (CRITICAL).
How do I remediate CVE-2026-66788?
A fix for CVE-2026-66788 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66788 are linked in the Vendor Advisories panel on this page.

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