Multiple vulnerabilities has been found and corrected in ghostscript:

Stack-based buffer overflow in the errprintf function in base/gsmisc.c
in ghostscript 8.64 through 8.70 allows remote attackers to cause a
denial of service (crash) and possibly execute arbitrary code via a
crafted PDF file, as originally reported for debug logging code in
gdevcups.c in the CUPS output driver (CVE-2009-4270).

Ghostscript 8.64, 8.70, and possibly other versions allows
context-dependent attackers to execute arbitrary code via a
PostScript file containing unlimited recursive procedure invocations,
which trigger memory corruption in the stack of the interpreter
(CVE-2010-1628).

As a precaution ghostscriptc has been rebuilt to link against the
system libpng library which was fixed with MDVSA-2010:133

Packages for 2008.0 and 2009.0 are provided as of the Extended
Maintenance Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct these issues.