The wmf_malloc function in api.c in libwmf 0.2.8.4 allows remote attackers to cause a denial of service (application crash) via a crafted wmf file, which triggers a memory allocation failure.
Slackware Security Advisory - New libwmf packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, 14.2, and -current to fix security issues.