Created icu tracking bugs for this issue:
Affects: fedora-all [bug 1444101]
Created mingw-icu tracking bugs for this issue:
Affects: epel-7 [bug 1444100]
Affects: fedora-all [bug 1444099]
This is the same vulnerability as CVE-2017-7867 (bug 1444097), though clusterfuzz identified it as different due to a slightly different stack trace when the crash occurred. Both are addressed by the same patch upstream, which correctly accounts for legacy 6-byte utf8 sequences.