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
10.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 64%CVSS: 10.0Exploit: cisa kev · epss top5pct · epss highExposed: 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)
EG Risk
100(Act)
EG Risk 100/100SSVC: Act

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
Severity100% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
64%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

May 22, 2026

Last Modified

July 23, 2026

Advisory Details (3)

Auto-updated Sep 4, 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 58× in last 7d / 240× 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 745 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 July 23, 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

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