Marc Schoenefeld found a stack-based buffer overflow in the way netpbm graphics file formats handling library used to process content of header fields of the X PixMap (XPM) image file. A remote attacker could provide a specially-crafted XPM image file and trick the local user into processing it, which would lead to denial of service (crash of application using the netpbm library) or, potentially, to execution of arbitrary code with the privileges of that application.

pnmtopng in netpbm before 10.25, when using the -trans option, uses uninitialized size and index variables when converting Portable Anymap (PNM) images to Portable Network Graphics (PNG), which might allow attackers to execute arbitrary code by modifying the stack.