Buffer overflow in the redir function in check_http.c in Nagios Plugins before 1.4.10, when running with the -f (follow) option, allows remote web servers to execute arbitrary code via Location header responses (redirects) with a large number of leading "L" characters.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.