CVE-2020-27761

WritePALMImage() in /coders/palm.c used size_t casts in several areas of a
calculation which could lead to values outside the range of representable
type unsigned long undefined behavior when a crafted input file was
processed by ImageMagick. The patch casts to ssize_t instead to avoid
this issue. Red Hat Product Security marked the Severity as Low because
although it could potentially lead to an impact to application
availability, no specific impact was shown in this case. This flaw affects
ImageMagick versions prior to ImageMagick 7.0.9-0.

Bugs

• <https://github.com/ImageMagick/ImageMagick/issues/1726&gt;