cext/manifest.c in Mercurial before 4.7.2 has an out-of-bounds read during parsing of a malformed manifest entry.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-17983.json"
[ { "events": [ { "introduced": "0" }, { "fixed": "4.7.2" } ] } ]