---
title: "CVE-2026-13639: Synology DiskStation Manager - Insufficient Entropy Vulnerability"
description: "Synology DiskStation Manager (DSM) < 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075 contains an insufficient entropy vulnerability in login logic, letting remote attackers read or write arbitrary files and cause denial of service, exploit requires network access."
url: https://panop.io/threat-heartbeat/CVE-2026-13639/
---

# CVE-2026-13639 Synology DiskStation Manager - Insufficient Entropy Vulnerability

Synology DiskStation Manager (DSM) < 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, and 7.4-90075 contains an insufficient entropy vulnerability in login logic, letting remote attackers read or write arbitrary files and cause denial of service, exploit requires network access.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.66% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-13639)

## Details

Type

Insufficient Entropy Vulnerability

Impact

File System Read, File System Write, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

18 September 2026

Updated

15 October 2026

Weakness

[CWE-331](https://cwe.mitre.org/data/definitions/331.html)

## Vendor fix

Update to version 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4, 7.4-90075 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-13639](https://nvd.nist.gov/vuln/detail/CVE-2026-13639)
- [https://www.synology.com/en-global/security/advisory/Synology\_SA\_26\_13](https://www.synology.com/en-global/security/advisory/Synology_SA_26_13)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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