zlib -- buffer overflow vulnerability

Problem description
A fixed-size buffer is used in the decompression of data
streams. Due to erronous analysis performed when zlib was
written, this buffer, which was belived to be sufficiently
large to handle any possible input stream, is in fact too
small.
Impact
A carefully constructed compressed data stream can result in
zlib overwriting some data structures. This may cause
applications to halt, resulting in a denial of service; or
it may result in an attacker gaining elevated privileges.