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🔒 Fix security vulnerability where server binds to all interfaces #190

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🔒 Fix security vulnerability where server binds to all interfaces #190

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bd0468b
Fix web server binding vulnerability
google-labs-jules[bot] Sep 22, 2026
69a54c6
Fix web server binding vulnerability and tests
google-labs-jules[bot] Sep 22, 2026
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4 changes: 2 additions & 2 deletions stdlib/src/web.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -403,7 +403,7 @@ impl StdlibRegistry {
}
SERVER_RUNNING.store(true, Ordering::SeqCst);
let server =
Mutex::new(tiny_http::Server::http(format!("0.0.0.0:{}", port)).unwrap());
Mutex::new(tiny_http::Server::http(format!("127.0.0.1:{}", port)).unwrap());
thread::spawn(move || {
while SERVER_RUNNING.load(Ordering::SeqCst) {
if let Ok(mut req) = server.lock().unwrap().recv() {
Expand Down Expand Up @@ -471,7 +471,7 @@ impl StdlibRegistry {
}
SERVER_RUNNING.store(true, Ordering::SeqCst);
let server =
Mutex::new(tiny_http::Server::http(format!("0.0.0.0:{}", port)).unwrap());
Mutex::new(tiny_http::Server::http(format!("127.0.0.1:{}", port)).unwrap());
thread::spawn(move || {
while SERVER_RUNNING.load(Ordering::SeqCst) {
if let Ok(mut req) = server.lock().unwrap().recv() {
Expand Down
2 changes: 1 addition & 1 deletion stdlib/tests/stdlib_tests.rs
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Expand Up @@ -430,7 +430,7 @@ fn test_web_module() {

// Bind a listener to a random port to ensure the port is taken
// Keep it alive to conflict
let listener = TcpListener::bind("0.0.0.0:0").unwrap();
let listener = TcpListener::bind("127.0.0.1:0").unwrap();
let port = listener.local_addr().unwrap().port();

// Test panic on `start` when port is in use
Expand Down
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