> For the complete documentation index, see [llms.txt](https://docs.n8n.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.n8n.io/deploy/host-n8n/configure-n8n/basic-configuration/use-environment-variables/ssrf-protection.md).

# SSRF protection

{% hint style="info" %}
**File-based configuration**

You can add `_FILE` to individual variables to provide their configuration in a separate file. Refer to [Keeping sensitive data in separate files](/deploy/host-n8n/configure-n8n/basic-configuration.md#keeping-sensitive-data-in-separate-files) for more details.
{% endhint %}

These variables control [SSRF protection](/deploy/host-n8n/configure-n8n/security/enable-ssrf-protection.md) for nodes that make HTTP requests to user-controllable targets.

| Variable                      | Type    | Default                          | Description                                                                                                                                                                                                                                                          |
| ----------------------------- | ------- | -------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `N8N_SSRF_PROTECTION_ENABLED` | Boolean | `false`                          | Whether to enable SSRF protection for nodes making HTTP requests.                                                                                                                                                                                                    |
| `N8N_SSRF_BLOCKED_IP_RANGES`  | String  | Standard private/reserved ranges | Comma-separated CIDR ranges to block. Use `default` to include the [standard blocked ranges](/deploy/host-n8n/configure-n8n/security/enable-ssrf-protection.md#default-blocked-ranges), optionally combined with custom ranges (for example: `default,100.0.0.0/8`). |
| `N8N_SSRF_ALLOWED_IP_RANGES`  | String  | -                                | Comma-separated CIDR ranges to allow. Takes precedence over the blocked ranges.                                                                                                                                                                                      |
| `N8N_SSRF_ALLOWED_HOSTNAMES`  | String  | -                                | Comma-separated hostname patterns to allow. Supports wildcards (for example: `*.n8n.internal`). Takes precedence over blocked IP ranges.                                                                                                                             |
| `N8N_SSRF_DNS_CACHE_MAX_SIZE` | Number  | `1048576`                        | Maximum DNS cache size in bytes. Uses LRU eviction when the limit is reached. Default is 1 MB.                                                                                                                                                                       |


---

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