Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0 SNMP API crlf injection

Summaryinfo

A vulnerability marked as very critical has been reported in Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0. Affected is an unknown function of the component SNMP API. This manipulation causes crlf injection. This vulnerability is tracked as CVE-2026-86343. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Synology DiskStation Manager up to 7.3.1/7.3.2-86009-4/7.4.1-90080-0. It has been declared as very critical. Affected by this vulnerability is an unknown code of the component SNMP API. The manipulation with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An improper neutralization of CRLF sequences vulnerability in the SNMP API in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote authenticated users with administrator privileges to read or write arbitrary files and conduct denial-of-service attacks.

The advisory is shared at synology.com. This vulnerability is known as CVE-2026-86343 since 09/07/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/12/2026).

Upgrading to version 7.3.2-86009-5 or 7.4.1-90080-1 eliminates this vulnerability.

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Productinfo

Type

• Network Attached Storage Software

Vendor

• Synology

Name

• DiskStation Manager

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.3.0
• 7.3.1
• 7.3.2-86009-4
• 7.4.1-90080-0

License

• commercial

Website

• Vendor: https://www.synology.com/

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