An issue was discovered in ext/standard/link_win32.c in PHP before 5.6.37, 7.0.x before 7.0.31, 7.1.x before 7.1.20, and 7.2.x before 7.2.8. The linkinfo function on Windows doesn't implement the open_basedir check. This could be abused to find files on paths outside of the allowed directories.
https://www.tenable.com/security/tns-2018-12
https://security.netapp.com/advisory/ntap-20181107-0003/
https://github.com/php/php-src/commit/f151e048ed27f6f4eef729f3310d053ab5da71d4
https://bugs.php.net/bug.php?id=76459