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.Referenceshttps://access.redhat.com/errata/RHSA-2020:0738https://security.gentoo.org/glsa/202003-15https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X3B5RWJQD5LA45MYLLR55KZJOJ5NVZGP/https://lists.debian.org/debian-lts-announce/2020/03/msg00024.htmlhttps://www.debian.org/security/2020/dsa-4646https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6IOHSO6BUKC6I66J5PZOMAGFVJ66ZS57/https://usn.ubuntu.com/4305-1/http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00004.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/https://www.oracle.com/security-alerts/cpujan2021.htmlhttps://chromereleases.googleblog.com/2020/02/stable-channel-update-for-desktop_24.htmlhttps://bugs.chromium.org/p/chromium/issues/detail?id=1044570https://chromium.googlesource.com/chromium/deps/icu/+/9f4020916eb1f28f3666f018fdcbe6c9a37f0e08https://unicode-org.atlassian.net/browse/ICU-20958https://github.com/unicode-org/icu/pull/971https://github.com/unicode-org/icu/commit/b7d08bc04a4296982fcef8b6b8a354a9e4e7afcahttps://www.oracle.com//security-alerts/cpujul2021.htmlhttps://www.oracle.com/security-alerts/cpuapr2022.html
