---
title: Do not disable TLS certificate validation
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > Code Security > Static Code Analysis (SAST) > SAST
  Rules > Do not disable TLS certificate validation
---

> For the complete documentation index, see [llms.txt](https://docs.datadoghq.com/llms.txt).

# Do not disable TLS certificate validation

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ({% placeholder "user-datadog-site-name" /%}).
{% /alert %}

{% /callout %}

## Metadata{% #metadata %}

**ID:** `dart-security/disabled-certificate-validation`

**Language:** Dart

**Severity:** Error

**Category:** Security

**CWE**: [295](https://cwe.mitre.org/data/definitions/295.html)

**Related CWEs**:

- [296](https://cwe.mitre.org/data/definitions/296.html)
- [299](https://cwe.mitre.org/data/definitions/299.html)

## Description{% #description %}

Setting `HttpClient.badCertificateCallback` to a function that always returns `true` disables TLS certificate validation entirely. Any server, including a malicious one performing a man in the middle attack, can intercept traffic undetected.

Remove the override or implement proper validation that rejects untrusted, expired, or self-signed certificates.

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```dart
import 'dart:io';

void main() {
  final client = HttpClient();
  client.badCertificateCallback = (X509Certificate cert, String host, int port) => true;
}
```

```dart
import 'dart:io';

void createInsecureClient() {
  final client = HttpClient();
  client.badCertificateCallback = (X509Certificate cert, String host, int port) {
    return true;
  };
}
```

## Compliant Code Examples{% #compliant-code-examples %}

```dart
import 'dart:io';

void main() {
  final client = HttpClient();
  client.badCertificateCallback = (X509Certificate cert, String host, int port) {
    return cert.subject.contains('example.com') && !cert.endValidity.isBefore(DateTime.now());
  };
}
```

```dart
import 'dart:io';

void main() async {
  final client = HttpClient();
  final request = await client.getUrl(Uri.parse('https://example.com'));
  final response = await request.close();
}
```
  Seamless integrations. Try Datadog Code SecurityDatadog Code Security 
{% icon name="icon-external-link" /%}