Quick answers
- Is CVE-2026-40535 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-40535 being exploited in the wild.
- How severe is CVE-2026-40535?
- Medium severity, with a CVSS score of 6.5, published 18 September 2026.
- Which products and versions are affected?
- Synology DiskStation Manager before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2.
- Is there a fix for CVE-2026-40535?
- A patch was published on 2026-04-15: Patches released: DSM 7.2.1-69057-10, 7.2.2-72806-7, 7.3.2-86009-2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-40535 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-40535?
- Check whether you run Synology DiskStation Manager 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
CVE-2026-40535 is a path traversal (CWE-22) vulnerability in the Desktop API component of Synology DSM. The vulnerability allows remote attackers without authentication (PR:N) to write limited files and conduct limited denial-of-service attacks via specially crafted requests over the network (AV:N, AC:L). The attack requires no user interaction and affects the integrity and availability of the system. Patches are available in DSM 7.2.1-69057-10, 7.2.2-72806-7, and 7.3.2-86009-2 or later.
Affected products
- Synology DiskStation Manager before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2
Timeline
- 2026-04-15: disclosed
- 2026-04-15: patched: Patches released: DSM 7.2.1-69057-10, 7.2.2-72806-7, 7.3.2-86009-2
- 2026-09-18: advisory