FreeBSD has just released a security advisory regarding zlib: http://lists.freebsd.org/pipermail/freebsd-announce/2005-July/001009.html Patch is expected to appear under: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-05:16/zlib.patch You might want to update the bundled copy of zlib in GnuPG.