The mget function in softmagic.c in file 5.x as used in the Fileinfo component in PHP before 5.4.40 5.5.x before 5.5.24 and 5.6.x before 5.6.8 does not properly maintain a certain pointer relationship which allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted string that is mishandled by a \Python script text executable\ rule.