diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index 38b473b8ce..f8126eeddf 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -61,9 +61,10 @@ bool zero_fill_all_buffers = false;
 
 namespace {
 
-inline void* BufferMalloc(size_t length) {
-  return zero_fill_all_buffers ? node::UncheckedCalloc(length) :
-                                 node::UncheckedMalloc(length);
+inline void* BufferMalloc(v8::Isolate* isolate, size_t length) {
+  auto* allocator = isolate->GetArrayBufferAllocator();
+  return zero_fill_all_buffers ? allocator->Allocate(length) :
+                                 allocator->AllocateUninitialized(length);
 }
 
 }  // namespace
@@ -241,7 +242,7 @@ MaybeLocal<Object> New(Isolate* isolate,
   char* data = nullptr;
 
   if (length > 0) {
-    data = static_cast<char*>(BufferMalloc(length));
+    data = static_cast<char*>(BufferMalloc(isolate, length));
 
     if (data == nullptr)
       return Local<Object>();
@@ -250,10 +251,11 @@ MaybeLocal<Object> New(Isolate* isolate,
     CHECK(actual <= length);
 
     if (actual == 0) {
-      free(data);
+      isolate->GetArrayBufferAllocator()->Free(data, length);
       data = nullptr;
     } else if (actual < length) {
-      data = node::Realloc(data, actual);
+      // We should call realloc here, but v8::ArrayBufferAllocator does not
+      // provide such ability.
     }
   }
 
@@ -262,7 +264,7 @@ MaybeLocal<Object> New(Isolate* isolate,
     return scope.Escape(buf);
 
   // Object failed to be created. Clean up resources.
-  free(data);
+  isolate->GetArrayBufferAllocator()->Free(data, length);
   return Local<Object>();
 }
 
@@ -286,7 +288,7 @@ MaybeLocal<Object> New(Environment* env, size_t length) {
 
   void* data;
   if (length > 0) {
-    data = BufferMalloc(length);
+    data = BufferMalloc(env->isolate(), length);
     if (data == nullptr)
       return Local<Object>();
   } else {
@@ -302,7 +304,7 @@ MaybeLocal<Object> New(Environment* env, size_t length) {
 
   if (ui.IsEmpty()) {
     // Object failed to be created. Clean up resources.
-    free(data);
+    env->isolate()->GetArrayBufferAllocator()->Free(data, length);
   }
 
   return scope.Escape(ui.FromMaybe(Local<Uint8Array>()));
@@ -327,10 +329,11 @@ MaybeLocal<Object> Copy(Environment* env, const char* data, size_t length) {
     return Local<Object>();
   }
 
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
   void* new_data;
   if (length > 0) {
     CHECK_NE(data, nullptr);
-    new_data = node::UncheckedMalloc(length);
+    new_data = allocator->AllocateUninitialized(length);
     if (new_data == nullptr)
       return Local<Object>();
     memcpy(new_data, data, length);
@@ -347,7 +350,7 @@ MaybeLocal<Object> Copy(Environment* env, const char* data, size_t length) {
 
   if (ui.IsEmpty()) {
     // Object failed to be created. Clean up resources.
-    free(new_data);
+    allocator->Free(new_data, length);
   }
 
   return scope.Escape(ui.FromMaybe(Local<Uint8Array>()));
diff --git a/src/node_crypto.cc b/src/node_crypto.cc
index cff8a5346c..269fd11af1 100644
--- a/src/node_crypto.cc
+++ b/src/node_crypto.cc
@@ -1890,7 +1890,8 @@ void SSLWrap<Base>::GetSession(const FunctionCallbackInfo<Value>& args) {
   int slen = i2d_SSL_SESSION(sess, nullptr);
   CHECK_GT(slen, 0);
 
-  char* sbuf = Malloc(slen);
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
+  char* sbuf = static_cast<char*>(allocator->AllocateUninitialized(slen));
   unsigned char* p = reinterpret_cast<unsigned char*>(sbuf);
   i2d_SSL_SESSION(sess, &p);
   args.GetReturnValue().Set(Buffer::New(env, sbuf, slen).ToLocalChecked());
@@ -3011,7 +3012,8 @@ CipherBase::UpdateResult CipherBase::Update(const char* data,
     return kErrorState;
   }
 
-  *out = Malloc<unsigned char>(buff_len);
+  auto* allocator = env()->isolate()->GetArrayBufferAllocator();
+  *out = static_cast<unsigned char*>(allocator->AllocateUninitialized(buff_len));
   int r = EVP_CipherUpdate(ctx_.get(),
                            *out,
                            out_len,
@@ -3053,7 +3055,8 @@ void CipherBase::Update(const FunctionCallbackInfo<Value>& args) {
   }
 
   if (r != kSuccess) {
-    free(out);
+    auto* allocator = env->isolate()->GetArrayBufferAllocator();
+    allocator->Free(out, out_len);
     if (r == kErrorState) {
       ThrowCryptoError(env, ERR_get_error(),
                        "Trying to add data in unsupported state");
@@ -3091,8 +3094,9 @@ bool CipherBase::Final(unsigned char** out, int* out_len) {
 
   const int mode = EVP_CIPHER_CTX_mode(ctx_.get());
 
-  *out = Malloc<unsigned char>(
-      static_cast<size_t>(EVP_CIPHER_CTX_block_size(ctx_.get())));
+  auto* allocator = env()->isolate()->GetArrayBufferAllocator();
+  *out = static_cast<unsigned char*>(allocator->AllocateUninitialized(
+      EVP_CIPHER_CTX_block_size(ctx_.get())));
 
   // In CCM mode, final() only checks whether authentication failed in update().
   // EVP_CipherFinal_ex must not be called and will fail.
@@ -3135,7 +3139,8 @@ void CipherBase::Final(const FunctionCallbackInfo<Value>& args) {
   bool r = cipher->Final(&out_value, &out_len);
 
   if (out_len <= 0 || !r) {
-    free(out_value);
+    auto* allocator = env->isolate()->GetArrayBufferAllocator();
+    allocator->Free(out_value, out_len);
     out_value = nullptr;
     out_len = 0;
     if (!r) {
@@ -3781,7 +3786,8 @@ void Verify::VerifyFinal(const FunctionCallbackInfo<Value>& args) {
 template <PublicKeyCipher::Operation operation,
           PublicKeyCipher::EVP_PKEY_cipher_init_t EVP_PKEY_cipher_init,
           PublicKeyCipher::EVP_PKEY_cipher_t EVP_PKEY_cipher>
-bool PublicKeyCipher::Cipher(const char* key_pem,
+bool PublicKeyCipher::Cipher(Environment* env,
+                             const char* key_pem,
                              int key_pem_len,
                              const char* passphrase,
                              int padding,
@@ -3790,6 +3796,7 @@ bool PublicKeyCipher::Cipher(const char* key_pem,
                              unsigned char** out,
                              size_t* out_len) {
   EVPKeyPointer pkey;
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
 
   BIOPointer bp(BIO_new_mem_buf(const_cast<char*>(key_pem), key_pem_len));
   if (!bp)
@@ -3837,7 +3844,7 @@ bool PublicKeyCipher::Cipher(const char* key_pem,
   if (EVP_PKEY_cipher(ctx.get(), nullptr, out_len, data, len) <= 0)
     return false;
 
-  *out = Malloc<unsigned char>(*out_len);
+  *out = static_cast<unsigned char*>(allocator->AllocateUninitialized(*out_len));
 
   if (EVP_PKEY_cipher(ctx.get(), *out, out_len, data, len) <= 0)
     return false;
@@ -3870,6 +3877,7 @@ void PublicKeyCipher::Cipher(const FunctionCallbackInfo<Value>& args) {
   ClearErrorOnReturn clear_error_on_return;
 
   bool r = Cipher<operation, EVP_PKEY_cipher_init, EVP_PKEY_cipher>(
+      env,
       kbuf,
       klen,
       args.Length() >= 3 && !args[2]->IsNull() ? *passphrase : nullptr,
@@ -3880,7 +3888,8 @@ void PublicKeyCipher::Cipher(const FunctionCallbackInfo<Value>& args) {
       &out_len);
 
   if (out_len == 0 || !r) {
-    free(out_value);
+    auto* allocator = env->isolate()->GetArrayBufferAllocator();
+    allocator->Free(out_value, out_len);
     out_value = nullptr;
     out_len = 0;
     if (!r) {
@@ -4085,7 +4094,8 @@ void DiffieHellman::GenerateKeys(const FunctionCallbackInfo<Value>& args) {
   const BIGNUM* pub_key;
   DH_get0_key(diffieHellman->dh_.get(), &pub_key, nullptr);
   size_t size = BN_num_bytes(pub_key);
-  char* data = Malloc(size);
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
+  char* data = static_cast<char*>(allocator->AllocateUninitialized(size));
   BN_bn2bin(pub_key, reinterpret_cast<unsigned char*>(data));
   args.GetReturnValue().Set(Buffer::New(env, data, size).ToLocalChecked());
 }
@@ -4104,7 +4114,8 @@ void DiffieHellman::GetField(const FunctionCallbackInfo<Value>& args,
   if (num == nullptr) return env->ThrowError(err_if_null);
 
   size_t size = BN_num_bytes(num);
-  char* data = Malloc(size);
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
+  char* data = static_cast<char*>(allocator->AllocateUninitialized(size));
   BN_bn2bin(num, reinterpret_cast<unsigned char*>(data));
   args.GetReturnValue().Set(Buffer::New(env, data, size).ToLocalChecked());
 }
@@ -4168,7 +4179,8 @@ void DiffieHellman::ComputeSecret(const FunctionCallbackInfo<Value>& args) {
       Buffer::Length(args[0]),
       0));
 
-  MallocedBuffer<char> data(DH_size(diffieHellman->dh_.get()));
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
+  MallocedBuffer<char> data(DH_size(diffieHellman->dh_.get()), allocator);
 
   int size = DH_compute_key(reinterpret_cast<unsigned char*>(data.data),
                             key.get(),
@@ -4388,13 +4400,14 @@ void ECDH::ComputeSecret(const FunctionCallbackInfo<Value>& args) {
   }
 
   // NOTE: field_size is in bits
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
   int field_size = EC_GROUP_get_degree(ecdh->group_);
   size_t out_len = (field_size + 7) / 8;
-  char* out = node::Malloc(out_len);
+  char* out = static_cast<char*>(allocator->AllocateUninitialized(out_len));
 
   int r = ECDH_compute_key(out, out_len, pub.get(), ecdh->key_.get(), nullptr);
   if (!r) {
-    free(out);
+    allocator->Free(out, out_len);
     return env->ThrowError("Failed to compute ECDH key");
   }
 
@@ -4424,11 +4437,13 @@ void ECDH::GetPublicKey(const FunctionCallbackInfo<Value>& args) {
   if (size == 0)
     return env->ThrowError("Failed to get public key length");
 
-  unsigned char* out = node::Malloc<unsigned char>(size);
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
+  unsigned char* out =
+      static_cast<unsigned char*>(allocator->AllocateUninitialized(size));
 
   int r = EC_POINT_point2oct(ecdh->group_, pub, form, out, size, nullptr);
   if (r != size) {
-    free(out);
+    allocator->Free(out, size);
     return env->ThrowError("Failed to get public key");
   }
 
@@ -4448,11 +4463,13 @@ void ECDH::GetPrivateKey(const FunctionCallbackInfo<Value>& args) {
   if (b == nullptr)
     return env->ThrowError("Failed to get ECDH private key");
 
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
   int size = BN_num_bytes(b);
-  unsigned char* out = node::Malloc<unsigned char>(size);
+  unsigned char* out =
+      static_cast<unsigned char*>(allocator->AllocateUninitialized(size));
 
   if (size != BN_bn2bin(b, out)) {
-    free(out);
+    allocator->Free(out, size);
     return env->ThrowError("Failed to convert ECDH private key to Buffer");
   }
 
@@ -4572,7 +4589,7 @@ class PBKDF2Request : public AsyncWrap, public ThreadPoolWork {
         success_(false),
         pass_(std::move(pass)),
         salt_(std::move(salt)),
-        key_(keylen),
+        key_(keylen, env->isolate()->GetArrayBufferAllocator()),
         iteration_count_(iteration_count) {
   }
 
@@ -4634,6 +4651,7 @@ void PBKDF2Request::AfterThreadPoolWork(int status) {
 
 void PBKDF2(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
 
   const EVP_MD* digest = nullptr;
   int keylen = -1;
@@ -4642,12 +4660,12 @@ void PBKDF2(const FunctionCallbackInfo<Value>& args) {
 
   int passlen = Buffer::Length(args[0]);
 
-  MallocedBuffer<char> pass(passlen);
+  MallocedBuffer<char> pass(passlen, allocator);
   memcpy(pass.data, Buffer::Data(args[0]), passlen);
 
   int saltlen = Buffer::Length(args[1]);
 
-  MallocedBuffer<char> salt(saltlen);
+  MallocedBuffer<char> salt(saltlen, allocator);
   memcpy(salt.data, Buffer::Data(args[1]), saltlen);
 
   iteration_count = args[2]->Int32Value(env->context()).FromJust();
@@ -4724,9 +4742,10 @@ class RandomBytesRequest : public AsyncWrap, public ThreadPoolWork {
   }
 
   inline void release() {
+    size_t free_size = size_;
     size_ = 0;
     if (free_mode_ == FREE_DATA) {
-      free(data_);
+      env()->isolate()->GetArrayBufferAllocator()->Free(data_, free_size);
       data_ = nullptr;
     }
   }
@@ -4840,7 +4859,8 @@ void RandomBytes(const FunctionCallbackInfo<Value>& args) {
 
   Local<Object> obj = env->randombytes_constructor_template()->
       NewInstance(env->context()).ToLocalChecked();
-  char* data = node::Malloc(size);
+  char* data = static_cast<char*>(
+      env->isolate()->GetArrayBufferAllocator()->AllocateUninitialized(size));
   std::unique_ptr<RandomBytesRequest> req(
       new RandomBytesRequest(env,
                              obj,
@@ -5015,8 +5035,9 @@ void VerifySpkac(const FunctionCallbackInfo<Value>& args) {
 }
 
 
-char* ExportPublicKey(const char* data, int len, size_t* size) {
+char* ExportPublicKey(Environment* env, const char* data, int len, size_t* size) {
   char* buf = nullptr;
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
 
   BIOPointer bio(BIO_new(BIO_s_mem()));
   if (!bio)
@@ -5037,7 +5058,7 @@ char* ExportPublicKey(const char* data, int len, size_t* size) {
   BIO_get_mem_ptr(bio.get(), &ptr);
 
   *size = ptr->length;
-  buf = Malloc(*size);
+  buf = static_cast<char*>(allocator->AllocateUninitialized(*size));
   memcpy(buf, ptr->data, *size);
 
   return buf;
@@ -5055,7 +5076,7 @@ void ExportPublicKey(const FunctionCallbackInfo<Value>& args) {
   CHECK_NE(data, nullptr);
 
   size_t pkey_size;
-  char* pkey = ExportPublicKey(data, length, &pkey_size);
+  char* pkey = ExportPublicKey(env, data, length, &pkey_size);
   if (pkey == nullptr)
     return args.GetReturnValue().SetEmptyString();
 
diff --git a/src/node_crypto.h b/src/node_crypto.h
index ee933ede1f..ddde9d6419 100644
--- a/src/node_crypto.h
+++ b/src/node_crypto.h
@@ -554,7 +554,8 @@ class PublicKeyCipher {
   template <Operation operation,
             EVP_PKEY_cipher_init_t EVP_PKEY_cipher_init,
             EVP_PKEY_cipher_t EVP_PKEY_cipher>
-  static bool Cipher(const char* key_pem,
+  static bool Cipher(Environment* env,
+                     const char* key_pem,
                      int key_pem_len,
                      const char* passphrase,
                      int padding,
diff --git a/src/stream_base.cc b/src/stream_base.cc
index 3708ffe7b6..2a107a33ca 100644
--- a/src/stream_base.cc
+++ b/src/stream_base.cc
@@ -355,7 +355,13 @@ void StreamResource::ClearError() {
 
 
 uv_buf_t StreamListener::OnStreamAlloc(size_t suggested_size) {
-  return uv_buf_init(Malloc(suggested_size), suggested_size);
+  CHECK_NE(stream_, nullptr);
+  StreamBase* stream = static_cast<StreamBase*>(stream_);
+  Environment* env = stream->stream_env();
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
+  return uv_buf_init(
+      static_cast<char*>(allocator->AllocateUninitialized(suggested_size)),
+      suggested_size);
 }
 
 
@@ -363,11 +369,12 @@ void EmitToJSStreamListener::OnStreamRead(ssize_t nread, const uv_buf_t& buf) {
   CHECK_NE(stream_, nullptr);
   StreamBase* stream = static_cast<StreamBase*>(stream_);
   Environment* env = stream->stream_env();
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
 
   if (nread <= 0)  {
-    free(buf.base);
+    allocator->Free(buf.base, buf.len);
     if (nread < 0)
       stream->CallJSOnreadMethod(nread, Local<Object>());
     return;
diff --git a/src/udp_wrap.cc b/src/udp_wrap.cc
index 1d1ded449b..7500793f78 100644
--- a/src/udp_wrap.cc
+++ b/src/udp_wrap.cc
@@ -447,7 +447,10 @@ void UDPWrap::OnSend(uv_udp_send_t* req, int status) {
 void UDPWrap::OnAlloc(uv_handle_t* handle,
                       size_t suggested_size,
                       uv_buf_t* buf) {
-  buf->base = node::Malloc(suggested_size);
+  auto* wrap = static_cast<UDPWrap*>(handle->data);
+  auto* allocator = wrap->env()->isolate()->GetArrayBufferAllocator();
+  buf->base =
+      static_cast<char*>(allocator->AllocateUninitialized(suggested_size));
   buf->len = suggested_size;
 }
 
@@ -457,14 +460,15 @@ void UDPWrap::OnRecv(uv_udp_t* handle,
                      const uv_buf_t* buf,
                      const struct sockaddr* addr,
                      unsigned int flags) {
-  if (nread == 0 && addr == nullptr) {
-    if (buf->base != nullptr)
-      free(buf->base);
-    return;
-  }
-
   UDPWrap* wrap = static_cast<UDPWrap*>(handle->data);
   Environment* env = wrap->env();
+  auto* allocator = env->isolate()->GetArrayBufferAllocator();
+
+  if (nread == 0 && addr == nullptr) {
+    if (buf->base != nullptr)
+      allocator->Free(buf->base, buf->len);
+    return;
+  }
 
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
@@ -479,13 +483,15 @@ void UDPWrap::OnRecv(uv_udp_t* handle,
 
   if (nread < 0) {
     if (buf->base != nullptr)
-      free(buf->base);
+      allocator->Free(buf->base, buf->len);
     wrap->MakeCallback(env->onmessage_string(), arraysize(argv), argv);
     return;
   }
 
-  char* base = node::UncheckedRealloc(buf->base, nread);
-  argv[2] = Buffer::New(env, base, nread).ToLocalChecked();
+  // Note that nread may be smaller thant buf->len, in that case the length
+  // passed to ArrayBufferAllocator::Free would not be the correct one, but
+  // it should be fine unless embedder is using some unusual memory allocator.
+  argv[2] = Buffer::New(env, buf->base, nread).ToLocalChecked();
   argv[3] = AddressToJS(env, addr);
   wrap->MakeCallback(env->onmessage_string(), arraysize(argv), argv);
 }
diff --git a/src/util.h b/src/util.h
index 0e6fd5dd06..183a1622dd 100644
--- a/src/util.h
+++ b/src/util.h
@@ -424,24 +424,35 @@ template <typename T>
 struct MallocedBuffer {
   T* data;
   size_t size;
+  v8::ArrayBuffer::Allocator* allocator;
 
   T* release() {
+    allocator = nullptr;
     T* ret = data;
     data = nullptr;
     return ret;
   }
 
-  MallocedBuffer() : data(nullptr) {}
-  explicit MallocedBuffer(size_t size) : data(Malloc<T>(size)), size(size) {}
-  MallocedBuffer(MallocedBuffer&& other) : data(other.data), size(other.size) {
+  MallocedBuffer() : data(nullptr), allocator(nullptr) {}
+  MallocedBuffer(size_t size, v8::ArrayBuffer::Allocator* allocator)
+      : size(size), allocator(allocator) {
+    data = static_cast<T*>(allocator->AllocateUninitialized(size));
+  }
+  MallocedBuffer(MallocedBuffer&& other)
+      : data(other.data), size(other.size), allocator(other.allocator) {
     other.data = nullptr;
+    other.allocator = nullptr;
   }
   MallocedBuffer& operator=(MallocedBuffer&& other) {
     this->~MallocedBuffer();
     return *new(this) MallocedBuffer(other);
   }
   ~MallocedBuffer() {
-    free(data);
+    if (allocator) {
+      allocator->Free(data, size);
+    } else {
+      free(data);
+    }
   }
   MallocedBuffer(const MallocedBuffer&) = delete;
   MallocedBuffer& operator=(const MallocedBuffer&) = delete;