CVE-2021-29623

Exiv2 is a C++ library and a command-line utility to read, write, delete
and modify Exif, IPTC, XMP and ICC image metadata. A read of uninitialized
memory was found in Exiv2 versions v0.27.3 and earlier. Exiv2 is a
command-line utility and C++ library for reading, writing, deleting, and
modifying the metadata of image files. The read of uninitialized memory is
triggered when Exiv2 is used to read the metadata of a crafted image file.
An attacker could potentially exploit the vulnerability to leak a few bytes
of stack memory, if they can trick the victim into running Exiv2 on a
crafted image file. The bug is fixed in version v0.27.4.