How severe is CVE-2026-3091?

CVE-2026-3091 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-3091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3091?

CVE-2026-3091 affects Synology Presto Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3091?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3091 have an EU (EUVD) identifier?

Yes. CVE-2026-3091 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7405.

When was CVE-2026-3091 published?

CVE-2026-3091 was published on 2026-02-24 and last updated on 2026-06-17.

CVE-2026-3091

CVE-2026-3091 is a medium-severity vulnerability in Synology Presto Client with a CVSS 3.x base score of 6.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-427.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7405
Weakness: CWE-427
Affected product: Synology Presto Client
Published: 2026-02-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3091?: CVE-2026-3091 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-3091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3091?: CVE-2026-3091 affects Synology Presto Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3091 have an EU (EUVD) identifier?: Yes. CVE-2026-3091 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7405.
When was CVE-2026-3091 published?: CVE-2026-3091 was published on 2026-02-24 and last updated on 2026-06-17.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_26_02

Affected products (1)

cpe:2.3:a:synology:presto_client:*:*:*:*:*:*:*:*

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