CVE-2026-15788

MEDIUM

WCOW cache mount source selector resolves NTFS junctions outside of cache root

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v4 5.6
EPSS 0.0014
EPSS Percentile 4.3%
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

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-59
Status published
Products (1)
moby/BuildKit < 0.31.2
Published Jul 20, 2026
Tracked Since Jul 21, 2026