Is CVE-2026-103665 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103665 being exploited in the wild.

How severe is CVE-2026-103665?

High severity, with a CVSS score of 7.8, published 29 October 2026.

Which products and versions are affected?

Yamaha LAN Monitor for Windows 1.9.3 and earlier.

How is CVE-2026-103665 attacked?

It is attacked with local access.

Am I affected by CVE-2026-103665?

Check whether you run Yamaha LAN Monitor for Windows at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-103665: Yamaha LAN Monitor for Windows insecure DLL loading

CVE-2026-103665 · Severity: high · CVSS 7.8 · Published 2026-10-29

Yamaha LAN Monitor for Windows is a network monitoring tool for Windows PCs. Its installer uses an insecure DLL search path, allowing an attacker to place a malicious DLL in the installation directory that gets loaded with administrative privileges. This can lead to arbitrary code execution, data theft, system compromise, or malware installation on the affected machine.

Vendors: Yamaha.

Quick answers

Is CVE-2026-103665 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103665 being exploited in the wild.
How severe is CVE-2026-103665?: High severity, with a CVSS score of 7.8, published 29 October 2026.
Which products and versions are affected?: Yamaha LAN Monitor for Windows 1.9.3 and earlier.
Is there a fix for CVE-2026-103665?: Yes: fixed in LAN Monitor for Windows 1.10.1. Until then: Obtain installers only from the official Yamaha website and do not execute installers from unknown or untrusted sources. Do not use installers contained in ZIP files provided by third parties. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-103665 attacked?: It is attacked with local access.
Am I affected by CVE-2026-103665?: Check whether you run Yamaha LAN Monitor for Windows at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: LAN Monitor for Windows 1.10.1

Obtain installers only from the official Yamaha website and do not execute installers from unknown or untrusted sources. Do not use installers contained in ZIP files provided by third parties.

Technical details

The vulnerability is an uncontrolled search path element (CWE-427) in the installer's DLL loading mechanism. An attacker can exploit this by placing a specially crafted DLL in the same directory as the installer; when a user runs the installer, the malicious DLL is loaded with administrative privileges, enabling arbitrary code execution. The vulnerability only affects the installation phase and does not impact already-installed instances of the application.

Affected products

Yamaha LAN Monitor for Windows 1.9.3 and earlier

Timeline

2026-10-28: disclosed
2026-10-29: advisory

References

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