What is CVE-2026-34054?

CVE-2026-34054 is a high-severity vulnerability in Microsoft Vcpkg, classified under Uncontrolled Search Path Element. CVSS score: 7.8/10. Published 2026-03-31.

How severe is CVE-2026-34054?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Microsoft Vcpkg

CVE-2026-34054

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 bee…

EPSS: 0.001 (17.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Vcpkg — versions < 3.6.1#3

Weakness classification (CWE)

CWE-427 — Uncontrolled Search Path Element

References

https://github.com/microsoft/vcpkg/security/advisories/GHSA-p322-v6vw-vrq9 (x_refsource_CONFIRM)
https://github.com/microsoft/vcpkg/pull/50518 (x_refsource_MISC)
https://github.com/microsoft/vcpkg/commit/5111afdf55cc1429d9951e4c7b02010e659346a9 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34054?: CVE-2026-34054 is a high-severity vulnerability in Microsoft Vcpkg, classified under Uncontrolled Search Path Element. CVSS score: 7.8/10. Published 2026-03-31.
How severe is CVE-2026-34054?: High severity. CVSS v3 base score is 7.8 out of 10.