In AdvanceCOMP 2.1, png_compress in pngex.cc in advpng has an integer overflow upon encountering an invalid PNG size, which results in an attempted memcpy to write into a buffer that is too small. (There is also a heap-based buffer over-read.)
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-9210.json"