CVE-2026-40536 Synology CVE debrief

Who should care

Synology DSM administrators and security teams responsible for patching and vulnerability management should assess exposure and prioritize patching for affected versions to mitigate potential security impacts. Additionally, operators and platform administrators may need to review and update their systems to ensure security posture.

Why it matters

CVE-2026-40536 is a medium-severity path traversal vulnerability in Synology DiskStation Manager (DSM) that allows remote authenticated users to obtain non-sensitive information. Synology DSM administrators and security teams should assess exposure, prioritize patching for affected versions, and monitor for potential information disclosure attempts. The vulnerability has a CVSS score of 4.3 and requires verification of DSM versions and patch application to mitigate potential security impacts.

• Potential information disclosure for sensitive data stored on affected systems
• Need for verification of DSM versions and patch application
• Potential impact on system security posture if left unpatched

Technical summary

The CVE-2026-40536 vulnerability is caused by an improper limitation of a pathname to a restricted directory in the Audio API of Synology DiskStation Manager (DSM). This allows remote authenticated users to obtain non-sensitive information. The vulnerability has a CVSS score of 4.3 and a severity of MEDIUM. To mitigate potential security impacts, Synology DSM administrators and security teams should assess exposure, prioritize patching for affected versions, and verify DSM versions and patch application. The vulnerability affects DSM versions before 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2.

Defensive priority

Medium-priority patching and verification recommended for Synology DSM installations

Recommended defensive actions

• Apply patches for affected Synology DSM versions
• Verify and update DSM installations to versions 7.2.1-69057-10, 7.2.2-72806-7, or 7.3.2-86009-2
• Monitor for potential information disclosure attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on exploitation or impact is limited. Synology security advisories and official documentation may offer further insights into affected versions and patching guidance. Defenders should verify DSM versions, assess exposure, and monitor for potential information disclosure attempts. The lack of detailed information on exploitation or impact requires a cautious approach to vulnerability management.

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.