CVE-2026-3091: Uncontrolled Search Path Element in Synology Synology Presto Client
An uncontrolled search path element vulnerability in Synology Presto Client before 2.1.3-0672 allows local users to read or write arbitrary files and conduct denial-of-service during installation by placing a malicious DLL in advance in the same directory as the installer.
AI Analysis
Technical Summary
This vulnerability in Synology Presto Client arises from an uncontrolled search path element, where the installer loads DLLs from its current directory without proper validation. Local attackers with limited privileges can exploit this by placing a malicious DLL in the installer's directory before installation, leading to arbitrary file read/write and denial-of-service conditions. The issue affects all versions prior to 2.1.3-0672.
Potential Impact
Successful exploitation can result in local privilege escalation through arbitrary file manipulation and denial-of-service during installation. Confidentiality, integrity, and availability of the system can be impacted due to the ability to read or write arbitrary files and disrupt installation processes.
Mitigation Recommendations
A fix is available in Synology Presto Client version 2.1.3-0672 and later. Users should upgrade to this version or newer to remediate the vulnerability. No additional vendor advisory content is provided; therefore, patch status is based on the version information in the description.
CVE-2026-3091: Uncontrolled Search Path Element in Synology Synology Presto Client
Description
An uncontrolled search path element vulnerability in Synology Presto Client before 2.1.3-0672 allows local users to read or write arbitrary files and conduct denial-of-service during installation by placing a malicious DLL in advance in the same directory as the installer.
CVSS v3.1
Score 6.7medium
Affected software
pkg:rpm/synology/presto-clientRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Synology Presto Client arises from an uncontrolled search path element, where the installer loads DLLs from its current directory without proper validation. Local attackers with limited privileges can exploit this by placing a malicious DLL in the installer's directory before installation, leading to arbitrary file read/write and denial-of-service conditions. The issue affects all versions prior to 2.1.3-0672.
Potential Impact
Successful exploitation can result in local privilege escalation through arbitrary file manipulation and denial-of-service during installation. Confidentiality, integrity, and availability of the system can be impacted due to the ability to read or write arbitrary files and disrupt installation processes.
Mitigation Recommendations
A fix is available in Synology Presto Client version 2.1.3-0672 and later. Users should upgrade to this version or newer to remediate the vulnerability. No additional vendor advisory content is provided; therefore, patch status is based on the version information in the description.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- synology
- Date Reserved
- 2026-02-24T01:34:19.753Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 699d14d8be58cf853b182c6b
Added to database: 02/24/2026, 03:02:48 UTC
Last enriched: 06/02/2026, 20:10:37 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 305
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