diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index b177cf0a5206..3241994f04ac 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -3747,10 +3747,17 @@ void PeerManagerImpl::ProcessMessage(CNode& pfrom, const std::string& msg_type,
     }
 
     if (msg_type == NetMsgType::SENDCMPCT) {
-        bool sendcmpct_hb{false};
+        uint8_t sendcmpct_hb{0};
         uint64_t sendcmpct_version{0};
         vRecv >> sendcmpct_hb >> sendcmpct_version;
 
+        // BIP152: the first integer is interpreted as a boolean and MUST have a
+        // value of either 1 or 0.
+        if (sendcmpct_hb > 1) {
+            Misbehaving(*peer, "invalid sendcmpct announce field");
+            return;
+        }
+
         // Only support compact block relay with witnesses
         if (sendcmpct_version != CMPCTBLOCKS_VERSION) return;
 
diff --git a/test/functional/p2p_compactblocks.py b/test/functional/p2p_compactblocks.py
index da8a0aed9ac5..df8d8c39e71c 100755
--- a/test/functional/p2p_compactblocks.py
+++ b/test/functional/p2p_compactblocks.py
@@ -264,6 +264,16 @@ def check_announcement_of_new_block(node, peer, predicate):
         test_node.send_and_ping(msg_sendcmpct(announce=False, version=2))
         check_announcement_of_new_block(node, test_node, lambda p: "cmpctblock" not in p.last_message and "headers" in p.last_message)
 
+    # BIP152 mandates that the announce field of a sendcmpct message is a
+    # boolean and MUST have a value of either 1 or 0. Sending any other value
+    # should be treated as misbehavior and lead to a disconnect.
+    def test_invalid_sendcmpct_announce(self):
+        node = self.nodes[0]
+        bad_peer = node.add_p2p_connection(TestP2PConn())
+        msg = msg_sendcmpct(announce=2, version=2)
+        with node.assert_debug_log(['invalid sendcmpct announce field']):
+            bad_peer.send_await_disconnect(msg)
+
     # This test actually causes bitcoind to (reasonably!) disconnect us, so do this last.
     def test_invalid_cmpctblock_message(self):
         self.generate(self.nodes[0], COINBASE_MATURITY + 1)
@@ -999,6 +1009,9 @@ def run_test(self):
         # The previous test will lead to a disconnection. Reconnect before continuing.
         self.segwit_node = self.nodes[0].add_p2p_connection(TestP2PConn())
 
+        self.log.info("Testing invalid announce field in sendcmpct message...")
+        self.test_invalid_sendcmpct_announce()
+
         self.log.info("Testing invalid index in cmpctblock message...")
         self.test_invalid_cmpctblock_message()