---
title: "CVE-2026-8398: Daemon Tools Lite Embedded Malicious Code Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-8398/
description: "CVE-2026-8398 (Daemon Daemon Tools Lite): Exploited in the wild (CISA KEV). A supply chain attack compromised the official installation packages of DAEMON…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-15
date_modified: 2026-05-28
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-8398"
kev: true
cvss: 9.3
epss: 0.00963
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Daemon Daemon Tools Lite. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-05-27, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-05-30 ; treat that as the outer limit, not the target.
- EPSS 1.0% , percentile 61: FIRST’s model estimates a 1.0% chance of exploitation activity in the next 30 days, higher than 61% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- AVB Disc Soft DAEMON Tools Lite: 12.5.0.2421 < 2.6.0.*

## Severity

- Kaspersky CVSS 4.0: 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`
- Kaspersky CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-05-27; federal due date 2026-05-30. Known ransomware use: Unknown.
- CISA 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 SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.96% probability of exploitation activity in the next 30 days; percentile 61.

## Sources

- [Security Incident Affecting DAEMON Tools Lite: What We Know So Far](https://blog.daemon-tools.cc/post/security-incident)
- [CVE.org record CVE-2026-8398](https://www.cve.org/CVERecord?id=CVE-2026-8398)
- [NVD entry CVE-2026-8398](https://nvd.nist.gov/vuln/detail/CVE-2026-8398)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8398)
- [DAEMON Tools software infected – supply chain attack ongoing since April 8, 2026](https://securelist.com/tr/daemon-tools-backdoor/119654/)

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Source page: https://erroneo.us/security/cve/CVE-2026-8398/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt