CVE-2026-66781

MEDIUMPre-NVD 5.46.5▲
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-18. the CNA's CVSS baseline 5.4; sources differ by 1.1.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in the Submariner operator. The Submariner Custom Resource (CR), used for configuring network connectivity, stores the IPsec pre-shared key (PSK) in an unencrypted format. This key, which is critical for securing communication between Kubernetes clusters, can be accessed by unauthorized parties. Such access enables an attacker to passively decrypt network traffic flowing between any two clusters in the mesh, resulting in sensitive information disclosure.

CVSS v3
5.4
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

August 18, 2026

Last Modified

September 5, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
Patch available. Sources: redhat.
redhat

2507526 – (CVE-2026-66781) CVE-2026-66781 submariner-operator: submariner-operator: IPsec PSK stored cleartext in Submariner CR spec

https://bugzilla.redhat.com/show_bug.cgi?id=2507526
redhat Patch Available

CVE-2026-66781 - 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-2026-66781

Vendor Advisories for CVE-2026-66781(8)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhacm2/submariner-rhel9-operator:17880734812026-09-03redhat
redhatrhacm2/submariner-addon-rhel9:17876890132026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873627562026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873627332026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873659712026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873626582026-08-26redhat
redhatrhacm2/submariner-addon-rhel9:17873626942026-08-26redhat

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 22× in last 7d / 113× 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 123 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 08:27 UTCEG score recompute
  3. 2026-09-18 08:27 UTCVendor advisory
  4. 2026-09-18 08:27 UTCGHSA enrichment
  5. 2026-09-17 07:46 UTCEG score recompute
  6. 2026-09-17 07:46 UTCVendor advisory
  7. 2026-09-17 07:46 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 07:04 UTCEG score recompute
  10. 2026-09-16 07:04 UTCVendor advisory
  11. 2026-09-16 07:04 UTCGHSA enrichment
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-15 06:33 UTCEG score recompute
  14. 2026-09-15 06:33 UTCVendor advisory
  15. 2026-09-15 06:33 UTCGHSA enrichment
  16. 2026-09-15 06:32 UTCGHSA enrichment
  17. 2026-09-14 06:01 UTCEG score recompute
  18. 2026-09-14 06:01 UTCVendor advisory
  19. 2026-09-14 06:01 UTCGHSA enrichment
  20. 2026-09-13 05:30 UTCEG score recompute
  21. 2026-09-13 05:30 UTCVendor advisory
  22. 2026-09-13 05:30 UTCGHSA enrichment
  23. 2026-09-12 04:59 UTCEG score recompute
  24. 2026-09-12 04:59 UTCVendor advisory
  25. 2026-09-12 04:59 UTCGHSA enrichment
Show 75 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:37 UTCEPSS rescore
  3. 2026-09-11 04:28 UTCEG score recompute
  4. 2026-09-11 04:28 UTCVendor advisory
  5. 2026-09-11 04:28 UTCGHSA enrichment
  6. 2026-09-10 03:57 UTCVendor advisory
  7. 2026-09-10 03:57 UTCGHSA enrichment
  8. 2026-09-09 03:25 UTCEG score recompute
  9. 2026-09-09 03:25 UTCVendor advisory
  10. 2026-09-09 03:25 UTCGHSA enrichment
  11. 2026-09-08 22:01 UTCEPSS rescore
  12. 2026-09-07 16:08 UTCEG score recompute
  13. 2026-09-07 16:08 UTCVendor advisory
  14. 2026-09-07 16:08 UTCGHSA enrichment
  15. 2026-09-07 16:01 UTCEPSS rescore
  16. 2026-09-06 14:55 UTCEG score recompute
  17. 2026-09-06 14:55 UTCVendor advisory
  18. 2026-09-06 14:55 UTCGHSA enrichment
  19. 2026-09-06 13:47 UTCEPSS rescore
  20. 2026-09-05 15:31 UTCEPSS rescore
  21. 2026-09-05 14:23 UTCEG score recompute
  22. 2026-09-05 14:23 UTCVendor advisory
  23. 2026-09-05 14:23 UTCGHSA enrichment
  24. 2026-09-04 13:53 UTCEG score recompute
  25. 2026-09-04 13:53 UTCVendor advisory
  26. 2026-09-04 13:53 UTCGHSA enrichment
  27. 2026-09-04 05:07 UTCEPSS rescore
  28. 2026-09-03 13:19 UTCEG score recompute
  29. 2026-09-03 13:19 UTCVendor advisory
  30. 2026-09-03 13:18 UTCGHSA enrichment
  31. 2026-09-03 05:01 UTCEG score recompute
  32. 2026-09-03 05:01 UTCVendor advisory
  33. 2026-09-03 05:00 UTCGHSA enrichment
  34. 2026-09-02 21:56 UTCEG score recompute
  35. 2026-09-02 21:56 UTCVendor advisory
  36. 2026-09-02 21:56 UTCGHSA enrichment
  37. 2026-09-02 14:12 UTCEPSS rescore
  38. 2026-09-01 20:22 UTCEG score recompute
  39. 2026-09-01 20:22 UTCVendor advisory
  40. 2026-09-01 20:21 UTCGHSA enrichment
  41. 2026-09-01 20:04 UTCEG score recompute
  42. 2026-09-01 20:04 UTCVendor advisory
  43. 2026-09-01 20:04 UTCGHSA enrichment
  44. 2026-09-01 20:02 UTCMITRE cvelistV5CVSS v3 → 5.4 · severity → MEDIUM
  45. 2026-09-01 19:35 UTCEG score recompute
  46. 2026-09-01 19:35 UTCVendor advisory
  47. 2026-09-01 19:35 UTCGHSA enrichment
  48. 2026-09-01 19:22 UTCMITRE cvelistV5
  49. 2026-09-01 13:54 UTCEPSS rescore
  50. 2026-09-01 07:10 UTCVendor advisory
  51. 2026-09-01 07:10 UTCGHSA enrichment
  52. 2026-08-31 06:39 UTCVendor advisory
  53. 2026-08-31 06:39 UTCGHSA enrichment
  54. 2026-08-30 06:08 UTCVendor advisory
  55. 2026-08-30 06:08 UTCGHSA enrichment
  56. 2026-08-29 05:37 UTCEG score recompute
  57. 2026-08-29 05:37 UTCVendor advisory
  58. 2026-08-29 05:36 UTCGHSA enrichment
  59. 2026-08-28 21:42 UTCEPSS rescore
  60. 2026-08-28 05:03 UTCEG score recompute
  61. 2026-08-28 05:03 UTCVendor advisory
  62. 2026-08-28 05:02 UTCGHSA enrichment
  63. 2026-08-27 04:29 UTCEG score recompute
  64. 2026-08-27 04:29 UTCVendor advisory
  65. 2026-08-27 04:29 UTCGHSA enrichment
  66. 2026-08-27 04:09 UTCEG score recompute
  67. 2026-08-27 04:09 UTCVendor advisory
  68. 2026-08-27 04:09 UTCGHSA enrichment
  69. 2026-08-26 22:22 UTCEG score recompute
  70. 2026-08-26 22:22 UTCGHSA enrichment
  71. 2026-08-26 22:04 UTCEG score recompute
  72. 2026-08-26 22:03 UTCGHSA enrichment
  73. 2026-08-26 18:13 UTCEG score recompute
  74. 2026-08-26 18:13 UTCGHSA enrichment
  75. 2026-08-26 14:47 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-66781?
CVE-2026-66781 is a medium vulnerability published on August 18, 2026. A flaw was found in the Submariner operator. The Submariner Custom Resource (CR), used for configuring network connectivity, stores the IPsec pre-shared key (PSK) in an unencrypted format. This key, which is critical for securing communication between Kubernetes clusters, can be accessed by…
When was CVE-2026-66781 disclosed?
CVE-2026-66781 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on September 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66781 actively exploited?
CVE-2026-66781 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 81.4% of all scored CVEs.
What is the CVSS score of CVE-2026-66781?
CVE-2026-66781 has a CVSS v4.0 base score of 5.4 (CNA self-assessment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.5.
How do I remediate CVE-2026-66781?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66781, 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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