A maliciously crafted TIFF and PCX file can be forced to read and write beyond allocated boundaries when parsing the TIFF and PCX file for based overflow. This vulnerability can be exploited to execute arbitrary code.
CWE-787 - Out-of-Bounds Write
Out-of-bounds write vulnerability is a memory access bug that allows software to write data past the end or before the beginning of the intended buffer. This may result in the corruption of data, a crash, or arbitrary code execution.