CRLF Injection in Synology DSM <7.2.1-69057-10 allows file read/write
CVE-2026-40530 Published on September 18, 2026
An improper neutralization of CRLF sequences ('CRLF injection') vulnerability in User 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 authenticated users to read or write arbitrary files and conduct denial-of-service attacks after the system is rebooted.
Vulnerability Analysis
CVE-2026-40530 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a CRLF Injection Vulnerability?
The software 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.
CVE-2026-40530 has been classified to as a CRLF Injection vulnerability or weakness.
Products Associated with CVE-2026-40530
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Affected Versions
Synology DiskStation Manager (DSM):- Version 7.3 and below 7.3.2-86009-2 is affected.
- Version 7.2.2 and below 7.2.2-72806-7 is affected.
- Version 7.2.1 and below 7.2.1-69057-10 is affected.
- Before 7.2.1 is unknown.