CVE-2026-40535 Path traversal in DiskStation Manager (DSM)
Remote attackers can exploit a path traversal flaw in Synology DSM to write limited files and cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40535?
CVE-2026-40535 is a medium-severity path traversal vulnerability in Synology DiskStation Manager (DSM), published on 18 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An improper limitation of a pathname to a restricted directory ('path traversal') vulnerability in Desktop API in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to write limited files and conduct limited denial-of-service attacks.
Weakness: CWE-22
Which versions are affected by CVE-2026-40535?
How do I fix CVE-2026-40535?
No fix has been published for CVE-2026-40535 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-40535 being exploited?
There is no known exploitation of CVE-2026-40535 in the wild and no public exploit code.
Sources
Also known as GHSA-m49g-9jxp-9jqm.