What is CVE-2026-3091?

CVE-2026-3091 is a medium-severity vulnerability in Synology Presto Client, classified under Uncontrolled Search Path Element. CVSS score: 6.7/10. Published 2026-02-24.

How severe is CVE-2026-3091?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Vulnerability in Synology Presto Client

CVE-2026-3091

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.

EPSS: 0.001 (4.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H.

Affected products

Synology Presto_client
Synology Presto Client

Weakness classification (CWE)

CWE-427 — Uncontrolled Search Path Element

References

security@synology.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-3091?: CVE-2026-3091 is a medium-severity vulnerability in Synology Presto Client, classified under Uncontrolled Search Path Element. CVSS score: 6.7/10. Published 2026-02-24.
How severe is CVE-2026-3091?: Medium severity. CVSS v3 base score is 6.7 out of 10.