CVE-2026-8398

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-05-27), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 9.8Exploit: cisa kev · ssvc activeExposed: 0

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

A supply chain attack compromised the official installation packages of DAEMON Tools Lite (Windows versions 12.5.0.2421 through 12.5.0.2434), distributed from the legitimate website daemon-tools.cc between approximately April 8, 2026, and May 5, 2026. Attackers gained unauthorized access to the vendor's (AVB Disc Soft) build or distribution infrastructure and trojanized three binaries: DTHelper.exe, DiscSoftBusServiceLite.exe, and DTShellHlp.exe. These files were digitally signed with the legitimate AVB Disc Soft code-signing certificate, allowing the malicious installers to appear trustworthy and bypass signature-based detection.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: 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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS PROB
1%
EPSS %ILE
71%
KEV
⚠ Exploited

Published

May 15, 2026

Last Modified

May 28, 2026

Advisory Details (3)

Auto-updated Aug 26, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
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-2026-8398
generic

Popular DAEMON Tools software compromised | Securelist

https://securelist.com/tr/daemon-tools-backdoor/119654/
generic

Security Incident Affecting DAEMON Tools Lite: What We Know So Far

https://blog.daemon-tools.cc/post/security-incident

Vendor Advisories for CVE-2026-8398(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 / 251× 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 685 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2026-8398?
CVE-2026-8398 is a critical vulnerability published on May 15, 2026. A supply chain attack compromised the official installation packages of DAEMON Tools Lite (Windows versions 12.5.0.2421 through 12.5.0.2434), distributed from the legitimate website daemon-tools.cc between approximately April 8, 2026, and May 5, 2026. Attackers gained unauthorized access to the…
When was CVE-2026-8398 disclosed?
CVE-2026-8398 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8398 actively exploited?
Yes. CISA added CVE-2026-8398 to the Known Exploited Vulnerabilities catalog on May 27, 2026, affecting Daemon Daemon Tools Lite. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-8398?
CVE-2026-8398 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2026-8398?
CVE-2026-8398 affects Daemon Daemon Tools Lite. 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-2026-8398?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8398, 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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