The pm_mallocarray2 function in lib/util/mallocvar.c in Netpbm through 10.81.03 allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted image file, as demonstrated by pbmmask.
https://github.com/xiaoqx/pocs/blob/master/netpbm
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00056.html