CVE-2026-15788
Published:July 20, 2026
Updated:August 06, 2026
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 Packages
https://github.com/moby/buildkit.git (GITHUB):
Affected version(s) >=v0.8.0 <v0.31.2Fix Suggestion:
Update to version v0.31.2github.com/moby/buildkit (GO):
Affected version(s) >=v0.8.0 <v0.31.2Fix Suggestion:
Update to version v0.31.2Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.6
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
ACTIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.5
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Link Resolution Before File Access ('Link Following')
EPSS
Base Score:
0.14