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%CVSS: 3.7Exploit: None knownExposed: 0

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
9.9(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

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 / EcosystemFixed in / 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 84× in last 7d / 298× 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 298 total refreshes for this CVE.

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

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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 79.1% of all scored CVEs.
What is the CVSS score of CVE-2026-66788?
CVE-2026-66788 has a CVSS v3 base score of 3.7 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.9.
How do I remediate CVE-2026-66788?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66788, 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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