CVE-2026-40531 Integer overflow in DiskStation Manager (DSM)
Remote authenticated users can cause limited denial-of-service via integer overflow in Synology DSM file operations.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40531?
CVE-2026-40531 is a medium-severity vulnerability in Synology DiskStation Manager (DSM), published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An integer overflow or wraparound vulnerability in File Operation in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote authenticated users to conduct limited denial-of-service attacks.
Weakness: CWE-190
Which versions are affected by CVE-2026-40531?
How do I fix CVE-2026-40531?
No fix has been published for CVE-2026-40531 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-40531 being exploited?
There is no known exploitation of CVE-2026-40531 in the wild and no public exploit code.
Sources
Also known as GHSA-hj3j-c7hh-gwq9.