CVE-2026-8398
Summary
| CVE | CVE-2026-8398 |
|---|---|
| State | PUBLISHED |
| Assigner | Kaspersky |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-15 09:16:17 UTC |
| Updated | 2026-05-28 12:57:00 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v4.0 9.3 CRITICAL from [email protected]
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.014370000 probability, percentile 0.697080000 (date 2026-06-23)
CISA KEV: Listed on 2026-05-27; due 2026-05-30; ransomware use Unknown
Problem Types: CWE-506 | CWE-506 CWE-506: Embedded Malicious Code
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 9.3 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 9.3 | CRITICAL | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | CVSS | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known Exploited Vulnerability
| Vendor | Daemon |
|---|---|
| Product | Daemon Tools Lite |
| Name | Daemon Tools Lite Embedded Malicious Code Vulnerability |
| Required Action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
| Notes | https://blog.daemon-tools.cc/post/security-incident ; https://nvd.nist.gov/vuln/detail/CVE-2026-8398 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Disc-soft | Daemon Tools | 12.5.1 | All | All | All |
| Operating System | Microsoft | Windows | - | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | AVB Disc Soft | DAEMON Tools Lite | affected 12.5.0.2421 2.6.0.* semver | Windows |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| securelist.com/tr/daemon-tools-backdoor/119654 | [email protected] | securelist.com | Exploit, Third Party Advisory |
| blog.daemon-tools.cc/post/security-incident | [email protected] | blog.daemon-tools.cc | Vendor Advisory |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
Vendor Comments And Credit
Discovery Credit
CNA: Igor Kuznetsov (Kaspersky) (en)
CNA: Georgy Kucherin (Kaspersky) (en)
CNA: Leonid Bezvershenko (Kaspersky) (en)
CNA: Anton Kargin (Kaspersky) (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-05-06T00:00:00.000Z | Advisory published by vendor |
| ADP | 2026-05-27T00:00:00.000Z | CVE-2026-8398 added to CISA KEV |
Solutions
CNA: Users of potentially infected application are recommended to uninstall the application, run a full system scan using antivirus software with the latest version of the anti-virus databases, and install the latest version of DAEMON Tools Lite (12.6 or newer) from the official website.