CVE-2026-13639 Weak cryptography in DiskStation Manager (DSM)
Remote attackers can exploit insufficient entropy in login logic to read or write arbitrary files and cause denial of service on Synology DSM.
- 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-2026-13639?
CVE-2026-13639 is a critical 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 insufficient entropy vulnerability in login logic in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote attackers to read or write arbitrary files and conduct denial-of-service attacks.
Weakness: CWE-331
Which versions are affected by CVE-2026-13639?
How do I fix CVE-2026-13639?
No fix has been published for CVE-2026-13639 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-13639 being exploited?
There is no known exploitation of CVE-2026-13639 in the wild and no public exploit code.
Sources
Also known as GHSA-q2v9-22q3-c377.