Skip to content

Availability: JSON DoS Vulnerability:An attacker sends a very large JSON message (like 100MB) to the server. #89

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
imxade merged 1 commit into from
Feb 16, 2026
+8 −0
Merged

Availability: JSON DoS Vulnerability:An attacker sends a very large JSON message (like 100MB) to the server. #89

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 8 additions & 0 deletions src/server/websocket.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ export function createWsServer(server: Server) {
const wss = new WebSocketServer({ noServer: true });
const inputHandler = new InputHandler();
const LAN_IP = getLocalIp();
const MAX_PAYLOAD_SIZE = 10 * 1024; // 10KB limit

console.log(`WebSocket Server initialized (Upgrade mode)`);
console.log(`WS LAN IP: ${LAN_IP}`);
Expand All @@ -44,6 +45,13 @@ export function createWsServer(server: Server) {
ws.on('message', async (data: string) => {
try {
const raw = data.toString();

// Prevent JSON DoS
if (raw.length > MAX_PAYLOAD_SIZE) {
console.warn('Payload too large, rejecting message.');
return;
}

const msg = JSON.parse(raw);

if (msg.type === 'get-ip') {
Expand Down