CVE-2026-34909

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score elevated to 10.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-06-23), indicating real-world exploitation has been confirmed by US federal agencies. a secondary CVSS source baseline 10.0 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — 4 sources updated this weekExploited in the wild
10.0
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 2%CVSS: 10.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.

CVSS v3
10.0
EG Score
10.0(high)
EPSS
81.1%
KEV
⚠ Exploited

Published

May 22, 2026

Last Modified

June 24, 2026

Advisory Details (3)

Auto-updated Jul 9, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
generic🔴 Active Exploitation

CVE-2026-34910 Exploitation ITW – building a botnet (MIRAI) – PwnDefend

https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34909
generic
https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b

Vendor Advisories for CVE-2026-34909(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 104× in last 7d / 359× 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 583 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2026-34909?
CVE-2026-34909 is a critical vulnerability published on May 22, 2026. A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to access files on the underlying system that could be manipulated to access an underlying account.
When was CVE-2026-34909 disclosed?
CVE-2026-34909 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34909 actively exploited?
Yes. CISA added CVE-2026-34909 to the Known Exploited Vulnerabilities catalog on June 23, 2026, affecting Ubiquiti UniFi OS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-34909?
CVE-2026-34909 has a CVSS v3 base score of 10.0 (NVD).
Which products are affected by CVE-2026-34909?
CVE-2026-34909 affects Ubiquiti UniFi OS. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-34909?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34909, 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

Explore the affected products and dependency analysis for CVE-2026-34909

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