xine-lib 1.1.12 and other 1.1.15 and earlier versions does not properly handle (a) negative and (b) zero values during unspecified read function calls in input_file.c input_net.c input_smb.c and input_http.c which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via vectors such as (1) a file or (2) an HTTP response which triggers consequences such as out-of-bounds reads and heap-based buffer overflows.