diff --git a/CHANGELOG.md b/CHANGELOG.md
index 498da6fde..11774f7d0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ SPDX-License-Identifier: GPL-3.0-or-later
 - irc: fix unit of server option `anti_flood` from seconds to milliseconds in output of `/server listfull`
 - irc: fix creation of irc.msgbuffer option without a server name
 - irc: ignore self join if the channel is already joined ([#2291](https://github.com/weechat/weechat/issues/2291))
+- relay/api: fix memory leaks in resources "ping" and "sync"
 
 ## Version 4.8.1 (2025-12-01)
 
diff --git a/src/plugins/relay/api/relay-api-protocol.c b/src/plugins/relay/api/relay-api-protocol.c
index fbc8da059..589b86b26 100644
--- a/src/plugins/relay/api/relay-api-protocol.c
+++ b/src/plugins/relay/api/relay-api-protocol.c
@@ -1056,13 +1056,15 @@ RELAY_API_PROTOCOL_CALLBACK(ping)
                                cJSON_CreateString ((ptr_data) ? ptr_data : ""));
         relay_api_msg_send_json (client, RELAY_HTTP_200_OK, NULL, "ping", json);
         cJSON_Delete (json);
-        cJSON_Delete (json_body);
     }
     else
     {
         relay_api_msg_send_json (client, RELAY_HTTP_204_NO_CONTENT, NULL, NULL, NULL);
     }
 
+    if (json_body)
+        cJSON_Delete (json_body);
+
     return RELAY_API_PROTOCOL_RC_OK;
 }
 
@@ -1121,6 +1123,9 @@ RELAY_API_PROTOCOL_CALLBACK(sync)
 
     relay_api_msg_send_json (client, RELAY_HTTP_204_NO_CONTENT, NULL, NULL, NULL);
 
+    if (json_body)
+        cJSON_Delete (json_body);
+
     return RELAY_API_PROTOCOL_RC_OK;
 }