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

RBRecent Breaches Vulnerability Intelligence·May 27, 2026
CVSS 9.3 · Critical⚠ Actively exploited (CISA KEV)
9.3
CVSS score
Critical
Severity
Active
CISA KEV
No
Ransomware use
May 30, 2026
Patch deadline
⚠ Exploited in the wild. CISA added CVE-2026-8398 to its Known Exploited Vulnerabilities catalog on May 27, 2026, with a federal patch deadline of May 30, 2026 — meaning attackers are actively using it. If you run the affected software, patch it immediately.

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.

DAEMON Tools Lite contains an embedded malicious code vulnerability identified as CVE-2026-8398. The weakness carries a high impact on confidentiality, integrity, and availability according to the CISA summary.

Organizations that rely on this software should review their deployments and follow the required actions issued by CISA.

How it works

The vulnerability is classified under CWE-506, which covers embedded malicious code. In this class of weakness, unauthorized code is present within the application and can affect core security properties without requiring additional attacker actions beyond the presence of the affected software.

Because the summary describes the issue as unspecified, technical readers should treat the exact trigger and execution path as unknown until the vendor advisory supplies further detail.

Am I affected? How to find it in your systems

Inventory all installations of DAEMON Tools Lite across endpoints and servers. Confirm the presence of the product and compare installed versions against the details published in the vendor advisory, as no specific version list is provided here.

How to remediate

Apply mitigations exactly as stated in the vendor instructions. If the advisory supplies an update, install it on all affected systems before considering other steps.

If you can't patch immediately

Until the vendor instructions can be implemented, reduce exposure by isolating systems that run the software and limiting network access to only required resources.

If your data may have been exposed

Actively exploited vulnerabilities of this type can lead to breaches. Readers may run a free exposure scan of their email addresses to check known breach data.

AICompiled with AI assistance from public sources and published under our editorial standards.

Details

AffectedDaemon · Daemon Tools Lite
WeaknessCWE-506
CVSS base score9.3 (Critical)
CVSS vectorCVSS: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
PublishedMay 15, 2026
Added to CISA KEVMay 27, 2026
Federal patch deadlineMay 30, 2026
Known ransomware useNot documented
Check if your data is exposed →

References

Official records: NVD · CISA KEV

← All actively-exploited vulnerabilities