Imlib before 1.9.13 sometimes uses the NetPBM package to load trusted images, which could allow attackers to cause a denial of service (crash) and possibly execute arbitrary code via certain weaknesses of NetPBM.
ftp://ftp.caldera.com/pub/security/OpenLinux/CSSA-2002-019.0.txt
distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000470
www.linux-mandrake.com/en/security/2002/MDKSA-2002-029.php
www.novell.com/linux/security/advisories/2002_015_imlib_txt.html
www.redhat.com/support/errata/RHSA-2002-048.html
www.securityfocus.com/bid/4339