Oniguruma through 6.9.3, as used in PHP 7.3.x and other products, has a heap-based buffer over-read in strlowercase_match in regexec.c.
{ "urgency": "low" }
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2019-19246.json"