It was reported  that libpng 1.5.4 suffered from a flaw when encountering a malformed cHRM chunk in a PNG graphics file. libpng would perform a divide-by-zero, which would cause libpng, or any application linked to libpng, to crash.
This flaw only affected libpng 1.5.4 where it was introduced, and is corrected in version 1.5.5. 
Not vulnerable. This issue did not affect the versions of libpng as shipped with Red Hat Enterprise Linux 4, 5, or 6.
This does not affect anything we ship; we do not provide libpng 1.5.x in any product.