There is a heap-based buffer over-read in the Exiv2::tEXtToDataBuf function of pngimage.cpp in Exiv2 0.27-RC3. A crafted input will lead to a remote denial of service attack.
{ "versions": [ { "introduced": "0" }, { "last_affected": "0.27-rc3" } ] }
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-20096.json"