CVE-2026-15788 [HIGH] – BuildKit’s cache mount source= selector on Windows Container on Windows (WCOW) workers doe

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.