Summaryinfo

A vulnerability has been found in Microsoft vcpkg up to 3.6.1#2 and classified as problematic. This affects an unknown part of the component OpenSSL. This manipulation causes uncontrolled search path. This vulnerability is handled as CVE-2026-34054. It is possible to launch the attack on the local host. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Microsoft vcpkg up to 3.6.1#2. It has been declared as critical. Affected by this vulnerability is an unknown part of the component OpenSSL. The manipulation with an unknown input leads to a uncontrolled search path vulnerability. The CWE definition for the vulnerability is CWE-427. The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

vcpkg is a free and open-source C/C++ package manager. Prior to version 3.6.1#3, vcpkg's Windows builds of OpenSSL set openssldir to a path on the build machine, making that path be attackable later on customer machines. This issue has been patched in version 3.6.1#3.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-34054 since 03/25/2026. The exploitation appears to be difficult. An attack has to be approached locally. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/31/2026). MITRE ATT&CK project uses the attack technique T1574 for this issue.

Upgrading to version 3.6.1#3 eliminates this vulnerability. Applying the patch 5111afdf55cc1429d9951e4c7b02010e659346a9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Microsoft

Name

• vcpkg

Version

• 3.6.1#2

License

• commercial

Website

• Vendor: https://www.microsoft.com/
• Product: https://github.com/microsoft/vcpkg/

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