In Exiv2 0.26, an out-of-bounds read in IptcData::printStructure in iptc.c could result in a crash or information leak, related to the "== 0x1c" case.
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00009.html
https://access.redhat.com/errata/RHSA-2019:2101
https://github.com/Exiv2/exiv2/issues/263