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 — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1.0%CVSS: 9.8Exploit: cisa kev · ssvc activeExposed services: Not assessed

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

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
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100CISA 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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low mission impact and as soon as possible at medium or high, and watch the vendor's advisory for the fix.
EPSS PROB
1.0%
EPSS %ILE
60th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low mission impact and as soon as possible at medium or high, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable yes (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

May 15, 2026

Last Modified

May 28, 2026

Advisory Details (3)

Auto-updated Oct 8, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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 53× in last 7d / 241× 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 1,049 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 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 attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
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.
How do I remediate CVE-2026-8398?
No fix for CVE-2026-8398 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-8398 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-8398

Explore →

Is Your Infrastructure Affected by CVE-2026-8398?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs