DockerCVE-2026-15788

Docker BuildKit: link following

CVE-2026-15788 · Published Jul 20, 2026 · updated Aug 5, 2026

Medium5.6

Fix: upgrade to 0.31.2 or later

BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.

Affected versions

Package	Affected	Fixed in
BuildKit Product	< 0.31.2	0.31.2

Details and references

CVSS 4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-59

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