diff --git a/apps/server/src/network/handlers/game/registerGameHandlers.ts b/apps/server/src/network/handlers/game/registerGameHandlers.ts
index 2535eb5..d457550 100644
--- a/apps/server/src/network/handlers/game/registerGameHandlers.ts
+++ b/apps/server/src/network/handlers/game/registerGameHandlers.ts
@@ -9,6 +9,8 @@
 import { movePlayerUseCase } from "@server/domains/game/application/useCases/movePlayerUseCase";
 import { createCommonHandlerContext } from "@server/network/handlers/CommonHandler";
 import { createGameEventPublisher } from "./createGameEventPublisher";
+import { logEvent } from "@server/logging/logEvent";
+import { isMovePayload, isPingPayload } from "@server/network/validation/socketPayloadValidators";
 
 export const registerGameHandlers = (
   io: Server,
@@ -19,7 +21,16 @@
   const common = createCommonHandlerContext(io, socket);
   const gamePublisher = createGameEventPublisher(common);
 
-  socket.on(protocol.SocketEvents.PING, (clientTime: number) => {
+  socket.on(protocol.SocketEvents.PING, (clientTime: unknown) => {
+    if (!isPingPayload(clientTime)) {
+      logEvent("Network", {
+        event: "PING",
+        result: "ignored_invalid_payload",
+        socketId: socket.id,
+      });
+      return;
+    }
+
     pingUseCase({
       clientTime,
       publishPong: gamePublisher.publishPongToSocket,
@@ -50,7 +61,16 @@
     });
   });
 
-  socket.on(protocol.SocketEvents.MOVE, (data: playerTypes.MovePayload) => {
+  socket.on(protocol.SocketEvents.MOVE, (data: unknown) => {
+    if (!isMovePayload(data)) {
+      logEvent("Network", {
+        event: "MOVE",
+        result: "ignored_invalid_payload",
+        socketId: socket.id,
+      });
+      return;
+    }
+
     movePlayerUseCase({
       gameManager,
       playerId: socket.id,
diff --git a/apps/server/src/network/handlers/room/registerRoomHandlers.ts b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
index be531ca..2d92107 100644
--- a/apps/server/src/network/handlers/room/registerRoomHandlers.ts
+++ b/apps/server/src/network/handlers/room/registerRoomHandlers.ts
@@ -5,6 +5,8 @@
 import { joinRoomUseCase } from "@server/domains/room/application/useCases/joinRoomUseCase";
 import { createCommonHandlerContext } from "@server/network/handlers/CommonHandler";
 import { createRoomEventPublisher } from "./createRoomEventPublisher";
+import { isJoinRoomPayload } from "@server/network/validation/socketPayloadValidators";
+import { logEvent } from "@server/logging/logEvent";
 
 export const registerRoomHandlers = (
   io: Server,
@@ -14,7 +16,16 @@
   const common = createCommonHandlerContext(io, socket);
   const roomPublisher = createRoomEventPublisher(common);
 
-  socket.on(protocol.SocketEvents.JOIN_ROOM, (data: roomTypes.JoinRoomPayload) => {
+  socket.on(protocol.SocketEvents.JOIN_ROOM, (data: unknown) => {
+    if (!isJoinRoomPayload(data)) {
+      logEvent("Network", {
+        event: "JOIN_ROOM",
+        result: "ignored_invalid_payload",
+        socketId: socket.id,
+      });
+      return;
+    }
+
     const { roomId } = data;
 
     socket.join(roomId);
diff --git a/apps/server/src/network/validation/socketPayloadValidators.ts b/apps/server/src/network/validation/socketPayloadValidators.ts
new file mode 100644
index 0000000..fffc822
--- /dev/null
+++ b/apps/server/src/network/validation/socketPayloadValidators.ts
@@ -0,0 +1,31 @@
+import type { playerTypes, roomTypes } from "@repo/shared";
+
+const isFiniteNumber = (value: unknown): value is number => {
+  return typeof value === "number" && Number.isFinite(value);
+};
+
+const isNonEmptyString = (value: unknown): value is string => {
+  return typeof value === "string" && value.trim().length > 0;
+};
+
+export const isPingPayload = (value: unknown): value is number => {
+  return isFiniteNumber(value);
+};
+
+export const isMovePayload = (value: unknown): value is playerTypes.MovePayload => {
+  if (typeof value !== "object" || value === null) {
+    return false;
+  }
+
+  const candidate = value as Record<string, unknown>;
+  return isFiniteNumber(candidate.x) && isFiniteNumber(candidate.y);
+};
+
+export const isJoinRoomPayload = (value: unknown): value is roomTypes.JoinRoomPayload => {
+  if (typeof value !== "object" || value === null) {
+    return false;
+  }
+
+  const candidate = value as Record<string, unknown>;
+  return isNonEmptyString(candidate.roomId) && isNonEmptyString(candidate.playerName);
+};