Integer overflow in the readpgm function in pnm.c for GOCR 0.40, when using the netpbm library, allows remote attackers to execute arbitrary code via a PNM file with large width and height values, which leads to a heap-based buffer overflow.

Heap-based buffer overflow in the readpgm function in pnm.c for GOCR 0.40, when it is not using netpbm, allows remote attackers to execute arbitrary code via a P3 format PNM file with more data than implied by its width and height values.