CVE-2026-8398

Exploitation

Exploited in the wild. Listed in the CISA Known Exploited Vulnerabilities catalog on 2026-05-27. Federal remediation due 2026-05-30.

SSVC decision

• ExploitationactiveCISA reports credible evidence of active exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.45% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 73.3% of scored records. A rank, not a probability.

NVD base score

9.3 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS 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/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

NVD analysis status

Analyzed. NVD last modified this record on 2026-10-26.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-05-15 07:30Z5 MO AGO

Last updated

2026-05-28 03:55Z5 MO AGO

Reserved

2026-05-12

Assigning CNA

Kaspersky

Record state

PUBLISHED

Severity

Critical (CVSS 9.3)

CNA CVSS 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

Weaknesses

• CWE-506Embedded Malicious CodeClass

Data version

5.2

Document digest

4fd04c01d013457db914f1525de376af515284bd9e19df0ea1f3af7b33295367

• securelist.comDAEMON Tools software infected – supply chain attack ongoing since April 8, 2026https://securelist.com/tr/daemon-tools-backdoor/119654/technical-descriptionthird-party-advisory
• blog.daemon-tools.ccSecurity Incident Affecting DAEMON Tools Lite: What We Know So Farhttps://blog.daemon-tools.cc/post/security-incidentvendor-advisory
• www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8398government-resource