Vulnerability in Docker go-archive Library Allows File Creation and Overwrite Outside Target Directory
A vulnerability has been identified in the go-archive archive processing library used by Docker and related software. The flaw, tracked as CVE-2026-17106, affects the Unpack, UnpackLayer, and Untar functions and permits files to be created or overwritten outside the intended extraction directory. The issue stems from a mismatch between the path string validated by the code and the actual path resolved by the operating system. Docker rated the vulnerability 7.1 under CVSS v4.0 and classified it as High severity. A proof-of-concept exploit has already been published for macOS and Linux. The fix was implemented in go-archive 0.3.0 and shipped in Docker Engine 29.7.0, Docker CLI 29.7.0, and Docker Desktop 4.86.0.
Security NEXTAug 21, 2026Translated from Japanese