An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.
https://www.oracle.com/security-alerts/cpujan2021.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.debian.org/security/2020/dsa-4646
https://usn.ubuntu.com/4305-1/
https://unicode-org.atlassian.net/browse/ICU-20958
https://security.gentoo.org/glsa/202003-15
https://lists.debian.org/debian-lts-announce/2020/03/msg00024.html
https://github.com/unicode-org/icu/pull/971
https://github.com/unicode-org/icu/commit/b7d08bc04a4296982fcef8b6b8a354a9e4e7afca
https://chromium.googlesource.com/chromium/deps/icu/+/9f4020916eb1f28f3666f018fdcbe6c9a37f0e08
https://chromereleases.googleblog.com/2020/02/stable-channel-update-for-desktop_24.html
https://bugs.chromium.org/p/chromium/issues/detail?id=1044570
https://access.redhat.com/errata/RHSA-2020:0738
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00004.html