CVE-2026-18188 ASUSTOR Inc. CVE debrief

Who should care

Defenders responsible for systems using ADM 4.1.0 through ADM 4.3.3.RUN1 and ADM 5.0.0 through ADM 5.1.3.RI81 should assess exposure and potential impact. This includes IT administrators, security teams, and vulnerability management teams who oversee these systems. They should prioritize verifying exposure, assessing potential impact, and implementing compensating controls to mitigate the risk of memory information disclosure or denial of service.

Why it matters

Defenders should prioritize verifying exposure and assessing potential impact due to the format string vulnerability in Rsync Backup on ADM, which could lead to memory information disclosure or denial of service.

• Potential memory information disclosure
• Potential denial of service of the affected backup component
• Requires verification of system configurations and logs for potential exploitation
• Requires assessment of exposure and potential impact for systems using affected ADM versions

Technical summary

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. The vulnerability affects ADM 4.1.0 through ADM 4.3.3.RUN1 and ADM 5.0.0 through ADM 5.1.3.RI81. This format string vulnerability could allow an attacker to access sensitive memory information or disrupt backup operations, potentially impacting system availability and data integrity.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact, particularly for systems using ADM 4.1.0 through ADM 4.3.3.RUN1 and ADM 5.0.0 through ADM 5.1.3.RI81.

Recommended defensive actions

• Verify system configurations and logs for potential exploitation
• Assess exposure and potential impact for systems using affected ADM versions
• Implement compensating controls to monitor and restrict access to backup components
• Review vendor guidance for ADM 4.1.0 through ADM 4.3.3.RUN1 and ADM 5.0.0 through ADM 5.1.3.RI81
• Conduct asset inventory of systems using affected ADM versions
• Monitor for suspicious activity related to Rsync Backup on ADM
• Plan for vendor-supported updates or mitigations through normal change control

Evidence notes

The CVE record and NVD vulnerability detail provide information on the format string vulnerability in Rsync Backup on ADM, including affected versions and potential impacts. 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. Evidence is limited to CVE and NVD details. Defenders should verify system rs

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.