CVE-2026-66785

CRITICALPre-NVD 2.59.9▲
EchelonGraph scoreMEDIUM confidence

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-20. A secondary CVSS source baseline 2.5; sources differ by 7.4.

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: 0.1%CVSS: 2.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traffic from other connected clusters (peer clusters) by publishing a specially crafted network endpoint. The system fails to properly validate the network subnets provided by the malicious cluster, enabling it to declare arbitrary network ranges. Consequently, all network traffic intended for these arbitrary ranges from peer clusters will be rerouted through the attacker's tunnel, potentially leading to unauthorized information disclosure or network disruption.

CVSS v3
2.5
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
0.1%
EPSS %ILE
1st
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

2507530 – (CVE-2026-66785) CVE-2026-66785 submariner: submariner: unvalidated Endpoint.Spec.Subnets propagated into WireGuard AllowedIPs / IPsec enables traffic hijack

https://bugzilla.redhat.com/show_bug.cgi?id=2507530
redhat Patch Available

CVE-2026-66785 - 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-2026-66785

Vendor Advisories for CVE-2026-66785(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-route-agent-rhel9:17880439702026-09-03redhat

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 72× in last 7d / 344× 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 495 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-66785?
CVE-2026-66785 is a critical vulnerability published on August 20, 2026. A flaw was found in Submariner. This vulnerability allows a malicious cluster (spoke) to redirect network traffic from other connected clusters (peer clusters) by publishing a specially crafted network endpoint. The system fails to properly validate the network subnets provided by the malicious…
When was CVE-2026-66785 disclosed?
CVE-2026-66785 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-2026-66785 actively exploited?
CVE-2026-66785 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66785?
CVE-2026-66785 has a CVSS base score of 2.5 (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-2026-66785?
A fix for CVE-2026-66785 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-66785 are linked in the Vendor Advisories panel on this page.

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