In Exiv2 0.26, there is a heap-based buffer over-read in the Exiv2::IptcData::printStructure function in iptc.cpp, related to the "!= 0x1c" case. Remote attackers can exploit this vulnerability to cause a denial of service via a crafted TIFF file.
"https://github.com/pypa/advisory-database/blob/main/vulns/exiv2/PYSEC-2018-123.yaml"