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

> Attackers compromised DAEMON Tools Lite installers to distribute trojanized binaries, enabling code execution on user systems.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Yes, since 27 May 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 May 2026
- **Updated:** 28 May 2026
- **Also known as:** GHSA-rm3r-35x9-jv93

## What is CVE-2026-8398?

CVE-2026-8398 is a critical vulnerability in AVB Disc Soft DAEMON Tools Lite, published on 15 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-506 (Embedded Malicious Code)

## Which versions are affected by CVE-2026-8398?

It affects 1 product.


Products: Disc-Soft Daemon Tools.

## How do I fix CVE-2026-8398?

No fix has been published for CVE-2026-8398 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 30 May 2026.

## Is CVE-2026-8398 being exploited?

Yes. Attackers have exploited CVE-2026-8398 in the wild since at least 27 May 2026.

## Other vulnerabilities in AVB Disc Soft DAEMON Tools Lite

- [CVE-2021-21832](https://insights.sbomify.com/CVE-2021-21832/): Memory corruption in Disc (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-8398 and fix it if it is affected.

What it is: CVE-2026-8398 is a critical vulnerability in AVB Disc Soft DAEMON Tools Lite, published on 15 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-8398 in the wild since at least 27 May 2026.

Affected product: AVB Disc Soft DAEMON Tools Lite. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-8398/ (Markdown: https://insights.sbomify.com/CVE-2026-8398/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-8398
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-8398
- OSV: https://osv.dev/vulnerability/CVE-2026-8398

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-8398/
Summaries are generated and may contain mistakes; the official description above is the record.