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 been patched in version 3.6.1#3.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.006 (48.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 48.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-34054: held from 0.007 to 0.006.

EPSS over last 30 days · oldest: 0.007 · newest: 0.006 · change: -0.001

Affected products

Weakness classification (CWE)

References

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.