The file_check_mem function in funcs.c in file before 5.23 as used in the Fileinfo component in PHP before 5.5.34 5.6.x before 5.6.20 and 7.x before 7.0.5 mishandles continuation-level jumps which allows context-dependent attackers to cause a denial of service (buffer overflow and application crash) or possibly execute arbitrary code via a crafted magic file.