diff --git a/libs/icu/Makefile b/libs/icu/Makefile
index 277ab05a03..76d611ab08 100644
--- a/libs/icu/Makefile
+++ b/libs/icu/Makefile
@@ -8,14 +8,14 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=icu4c
-MAJOR_VERSION:=65
+MAJOR_VERSION:=66
 MINOR_VERSION:=1
 PKG_VERSION:=$(MAJOR_VERSION).$(MINOR_VERSION)
-PKG_RELEASE:=2
+PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(MAJOR_VERSION)_$(MINOR_VERSION)-src.tgz
 PKG_SOURCE_URL:=https://github.com/unicode-org/icu/releases/download/release-$(MAJOR_VERSION)-$(MINOR_VERSION)
-PKG_HASH:=53e37466b3d6d6d01ead029e3567d873a43a5d1c668ed2278e253b683136d948
+PKG_HASH:=52a3f2209ab95559c1cf0a14f24338001f389615bf00e2585ef3dbc43ecf0a2e
 
 PKG_LICENSE:=ICU
 PKG_LICENSE_FILES:=LICENSE
@@ -137,6 +137,8 @@ define Host/Install
 	$(INSTALL_BIN)  $(HOST_BUILD_DIR)/bin/icupkg $(STAGING_DIR_HOSTPKG)/share/icu/$(PKG_VERSION)/bin/
 	$(INSTALL_BIN)  $(HOST_BUILD_DIR)/bin/pkgdata $(STAGING_DIR_HOSTPKG)/share/icu/$(PKG_VERSION)/bin/
 	$(CP)           $(HOST_BUILD_DIR)/lib/*.so* $(STAGING_DIR_HOSTPKG)/share/icu/$(PKG_VERSION)/lib/
+	$(RM)           $(STAGING_DIR_HOSTPKG)/share/icu/current
+	(cd $(STAGING_DIR_HOSTPKG)/share/icu;$(LN) $(PKG_VERSION) current)
 endef
 
 define Package/icu/install
diff --git a/libs/icu/patches/020-ICU-20958_CVE-2020-10531.patch b/libs/icu/patches/020-ICU-20958_CVE-2020-10531.patch
new file mode 100644
index 0000000000..a64e93061f
--- /dev/null
+++ b/libs/icu/patches/020-ICU-20958_CVE-2020-10531.patch
@@ -0,0 +1,118 @@
+From 1d824ede675782fcf9367e4bbcba1d998cdc33f1 Mon Sep 17 00:00:00 2001
+From: Frank Tang <ftang@chromium.org>
+Date: Sat, 1 Feb 2020 02:39:04 +0000
+Subject: [PATCH] ICU-20958 Prevent SEGV_MAPERR in append
+
+See #971
+---
+ icu4c/source/common/unistr.cpp          |  6 ++-
+ icu4c/source/test/intltest/ustrtest.cpp | 62 +++++++++++++++++++++++++
+ icu4c/source/test/intltest/ustrtest.h   |  1 +
+ 3 files changed, 68 insertions(+), 1 deletion(-)
+
+diff --git a/icu4c/source/common/unistr.cpp b/icu4c/source/common/unistr.cpp
+index 901bb3358ba..077b4d6ef20 100644
+--- a/common/unistr.cpp
++++ b/common/unistr.cpp
+@@ -1563,7 +1563,11 @@ UnicodeString::doAppend(const UChar *srcChars, int32_t srcStart, int32_t srcLeng
+   }
+ 
+   int32_t oldLength = length();
+-  int32_t newLength = oldLength + srcLength;
++  int32_t newLength;
++  if (uprv_add32_overflow(oldLength, srcLength, &newLength)) {
++    setToBogus();
++    return *this;
++  }
+ 
+   // Check for append onto ourself
+   const UChar* oldArray = getArrayStart();
+diff --git a/icu4c/source/test/intltest/ustrtest.cpp b/icu4c/source/test/intltest/ustrtest.cpp
+index b6515ea813c..ad38bdf53a3 100644
+--- a/test/intltest/ustrtest.cpp
++++ b/test/intltest/ustrtest.cpp
+@@ -67,6 +67,7 @@ void UnicodeStringTest::runIndexedTest( int32_t index, UBool exec, const char* &
+     TESTCASE_AUTO(TestWCharPointers);
+     TESTCASE_AUTO(TestNullPointers);
+     TESTCASE_AUTO(TestUnicodeStringInsertAppendToSelf);
++    TESTCASE_AUTO(TestLargeAppend);
+     TESTCASE_AUTO_END;
+ }
+ 
+@@ -2310,3 +2311,64 @@ void UnicodeStringTest::TestUnicodeStringInsertAppendToSelf() {
+     str.insert(2, sub);
+     assertEquals("", u"abbcdcde", str);
+ }
++
++void UnicodeStringTest::TestLargeAppend() {
++    if(quick) return;
++
++    IcuTestErrorCode status(*this, "TestLargeAppend");
++    // Make a large UnicodeString
++    int32_t len = 0xAFFFFFF;
++    UnicodeString str;
++    char16_t *buf = str.getBuffer(len);
++    // A fast way to set buffer to valid Unicode.
++    // 4E4E is a valid unicode character
++    uprv_memset(buf, 0x4e, len * 2);
++    str.releaseBuffer(len);
++    UnicodeString dest;
++    // Append it 16 times
++    // 0xAFFFFFF times 16 is 0xA4FFFFF1,
++    // which is greater than INT32_MAX, which is 0x7FFFFFFF.
++    int64_t total = 0;
++    for (int32_t i = 0; i < 16; i++) {
++        dest.append(str);
++        total += len;
++        if (total <= INT32_MAX) {
++            assertFalse("dest is not bogus", dest.isBogus());
++        } else {
++            assertTrue("dest should be bogus", dest.isBogus());
++        }
++    }
++    dest.remove();
++    total = 0;
++    for (int32_t i = 0; i < 16; i++) {
++        dest.append(str);
++        total += len;
++        if (total + len <= INT32_MAX) {
++            assertFalse("dest is not bogus", dest.isBogus());
++        } else if (total <= INT32_MAX) {
++            // Check that a string of exactly the maximum size works
++            UnicodeString str2;
++            int32_t remain = INT32_MAX - total;
++            char16_t *buf2 = str2.getBuffer(remain);
++            if (buf2 == nullptr) {
++                // if somehow memory allocation fail, return the test
++                return;
++            }
++            uprv_memset(buf2, 0x4e, remain * 2);
++            str2.releaseBuffer(remain);
++            dest.append(str2);
++            total += remain;
++            assertEquals("When a string of exactly the maximum size works", (int64_t)INT32_MAX, total);
++            assertEquals("When a string of exactly the maximum size works", INT32_MAX, dest.length());
++            assertFalse("dest is not bogus", dest.isBogus());
++
++            // Check that a string size+1 goes bogus
++            str2.truncate(1);
++            dest.append(str2);
++            total++;
++            assertTrue("dest should be bogus", dest.isBogus());
++        } else {
++            assertTrue("dest should be bogus", dest.isBogus());
++        }
++    }
++}
+diff --git a/icu4c/source/test/intltest/ustrtest.h b/icu4c/source/test/intltest/ustrtest.h
+index 218befdcc68..4a356a92c7a 100644
+--- a/test/intltest/ustrtest.h
++++ b/test/intltest/ustrtest.h
+@@ -97,6 +97,7 @@ class UnicodeStringTest: public IntlTest {
+     void TestWCharPointers();
+     void TestNullPointers();
+     void TestUnicodeStringInsertAppendToSelf();
++    void TestLargeAppend();
+ };
+ 
+ #endif