exiv2: denial of service in PngImage::readMetadata

An integer overflow in Exiv2 through 0.27.1 allows an attacker to cause a denial of service SIGSEGV via a crafted PNG image file, because PngImage::readMetadata mishandles a chunkLength - iccOffset subtraction...

ALPINE-CVE-2019-13108

An integer overflow in Exiv2 through 0.27.1 allows an attacker to cause a denial of service SIGSEGV via a crafted PNG image file, because PngImage::readMetadata mishandles a zero value for iccOffset...

CVE-2019-13109

An integer overflow in Exiv2 through 0.27.1 allows an attacker to cause a denial of service SIGSEGV via a crafted PNG image file, because PngImage::readMetadata mishandles a chunkLength - iccOffset subtraction...