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A weakness has been identified in UltraVNC 1.6.4.0 on...

High severity Unreviewed Published Mar 9, 2026 to the GitHub Advisory Database • Updated Mar 9, 2026

Package

No package listed— Suggest a package

Affected versions

Unknown

Patched versions

Unknown

Description

A weakness has been identified in UltraVNC 1.6.4.0 on Windows. This affects an unknown function in the library cryptbase.dll of the component Windows Service. This manipulation causes uncontrolled search path. The attack requires local access. A high degree of complexity is needed for the attack. The exploitability is reported as difficult. The vendor was contacted early about this disclosure but did not respond in any way.

References

Published by the National Vulnerability Database Mar 8, 2026
Published to the GitHub Advisory Database Mar 9, 2026
Last updated Mar 9, 2026

Severity

High

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(1st percentile)

Weaknesses

Untrusted Search Path

The product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control. Learn more on MITRE.

CVE ID

CVE-2026-3787

GHSA ID

GHSA-97cv-xr93-496p

Source code

No known source code

Dependabot alerts are not supported on this advisory because it does not have a package from a supported ecosystem with an affected and fixed version.

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