An issue was discovered in Exiv2 v0.26. The function Exiv2::DataValue::copy in value.cpp has a NULL pointer dereference.
https://github.com/Exiv2/exiv2/issues/457
https://access.redhat.com/errata/RHSA-2019:2101
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00009.html