Quick answers
- Is CVE-2026-40531 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-40531 being exploited in the wild.
- How severe is CVE-2026-40531?
- Medium severity, with a CVSS score of 4.3, published 18 September 2026.
- Which products and versions are affected?
- Synology DiskStation Manager (DSM) before 7.2.1-69057-10, before 7.2.2-72806-7, before 7.3.2-86009-2.
- Is there a fix for CVE-2026-40531?
- A patch was published on 2026-04-15: Patches released for DSM 7.2.1, 7.2.2, and 7.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-40531 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-40531?
- Check whether you run Synology DiskStation Manager (DSM) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An integer overflow or wraparound vulnerability (CWE-190) exists in the File Operation component of Synology DSM. The vulnerability requires remote network access and valid user authentication credentials; no special privileges or user interaction is needed. An authenticated attacker can trigger limited denial-of-service attacks by exploiting the integer overflow. Patches are available: DSM 7.2.1-69057-10, DSM 7.2.2-72806-7, and DSM 7.3.2-86009-2 or later.
Affected products
- Synology DiskStation Manager (DSM) before 7.2.1-69057-10, before 7.2.2-72806-7, before 7.3.2-86009-2
Timeline
- 2026-04-15: disclosed
- 2026-04-15: patched: Patches released for DSM 7.2.1, 7.2.2, and 7.3
- 2026-09-18: advisory