1 files changed, 14 insertions, 0 deletions
diff --git a/spec/requests/user_sends_null_bytes_spec.rb b/spec/requests/user_sends_null_bytes_spec.rb
new file mode 100644
index 00000000000..1ddfad40996
--- /dev/null
+++ b/spec/requests/user_sends_null_bytes_spec.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'User sends null bytes as params' do
+  let(:null_byte) { "\u0000" }
+
+  it 'raises a 400 error' do
+    post '/nonexistent', params: { a: "A #{null_byte} nasty string" }
+
+    expect(response).to have_gitlab_http_status(:bad_request)
+    expect(response.body).to eq('Bad Request')
+  end
+end