Exiv2::PngImage::readMetadata() in pngimage.cpp in Exiv2 0.27.99.0 allows attackers to cause a denial of service (heap-based buffer over-read) via a crafted image file.
https://github.com/Exiv2/exiv2/issues/953
https://lists.debian.org/debian-lts-announce/2023/01/msg00004.html