How severe is CVE-2026-18188?

CVE-2026-18188 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2026-18188 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-18188?

CVE-2026-18188 affects Asustor Data Master. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-18188?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-18188 published?

CVE-2026-18188 was published on 2026-07-30 and last updated on 2026-08-04.

CVE-2026-18188

CVE-2026-18188 is a high-severity vulnerability in Asustor Data Master with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-134.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 7.1
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-134
Affected product: Asustor Data Master
Published: 2026-07-30
Last modified: 2026-08-04

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-18188?: CVE-2026-18188 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2026-18188 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-18188?: CVE-2026-18188 affects Asustor Data Master. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-18188?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-18188 published?: CVE-2026-18188 was published on 2026-07-30 and last updated on 2026-08-04.

References

https://www.asustor.com/security/security_advisory_detail?id=67

Affected products (1)

cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:*

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Other CWE-134 vulnerabilities

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