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: 0.4%CVSS: 5.4Exploit: None knownExposed services: Not assessed

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
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
30th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 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 / EcosystemFix (by version range) / 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 20× in last 7d / 97× 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 172 total refreshes for this CVE.

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

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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 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 0.4% probability of exploitation in the next 30 days (30th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66781?
CVE-2026-66781 has a CVSS base score of 5.4 (the CNA's own assessment, by redhat; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.5 (MEDIUM).
How do I remediate CVE-2026-66781?
A fix for CVE-2026-66781 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66781 are linked in the Vendor Advisories panel on this page.

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