What is CVE-2026-18188?

CVE-2026-18188 is a high-severity vulnerability in Asustor Data Master, classified under Use of Externally-Controlled Format String. CVSS score: 8.1/10. Published 2026-07-30.

How severe is CVE-2026-18188?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Asustor Data Master

CVE-2026-18188

A format string vulnerability was found in the Rsync Backup on the ADM. The vulnerability occurs because user-controlled rsync backup configuration or log data may be processed through an unsafe format string operation. An authenticated attacker can exploit this issue to disclose memory information or cause denial of service of the affected backup component. Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RUN1 as well as from ADM 5.0.0 through ADM 5.1.3.RI81.

EPSS: 0.003 (18.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H.

Affected products

Asustor Data_master
Asustor Inc. Adm — versions 5.0.0, 4.1.0

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

References

security@asustor.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-18188?: CVE-2026-18188 is a high-severity vulnerability in Asustor Data Master, classified under Use of Externally-Controlled Format String. CVSS score: 8.1/10. Published 2026-07-30.
How severe is CVE-2026-18188?: High severity. CVSS v3 base score is 8.1 out of 10.