How severe is CVE-2026-8398?

CVE-2026-8398 has a CVSS 3.1 base score of 9.8 (CRITICAL). EPSS estimates a 1.0% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2026-8398: Daemon Tools Lite Embedded Malicious Code

CISA Known Exploited Vulnerabilities

Daemon Tools Lite Embedded Malicious Code Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2026-05-27

Remediation due

2026-05-30

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.

CISA notes
https://blog.daemon-tools.cc/post/security-incident ; https://nvd.nist.gov/vuln/detail/CVE-2026-8398

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.

Severity

CVSS 4.0 · CNA9.3 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

CVSS 3.1 · CNA9.8 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impacttotal

Affected Products

Vendor	Product	Affected versions
AVB Disc Soft	DAEMON Tools Lite	12.5.0.2421 to <2.6.0.*

References

2 Links

Vendor advisories

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

Third-party advisories

DAEMON Tools software infected – supply chain attack ongoing since April 8, 2026

Record Details

Published

2026-05-15

Last updated

2026-05-28

Assigner (CNA)

Kaspersky

Credited to

Igor Kuznetsov (Kaspersky); Georgy Kucherin (Kaspersky); Leonid Bezvershenko (Kaspersky); Anton Kargin (Kaspersky)

Related Tool Categories

Tool categories that test for or protect against this vulnerability class.

CWE-506 · Embedded Malicious Code

Software Composition Analysis Tools Malware Analysis Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.