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<p>Custom components and the component code editor allow Langflow users to create and execute Python code in the Langflow runtime.
While this freedom is a feature of Langflow, in some deployments you might want to block the creation of custom Langflow components to prevent arbitrary code execution.</p>
<p>To block custom component creation on a Langflow server, set the following <a class="" href="/environment-variables">environment variable</a>:</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_ALLOW_CUSTOM_COMPONENTS=false</span></div></div><br></code></div></div>
<p>When set to <code>false</code>, Langflow blocks creating custom components and changing code in the visual editor.</p>
<p>When unset or <code>true</code>, Langflow allows custom code.
Existing Langflow installations will keep the default <code>true</code> behavior until you opt in to this restriction.</p>
<p>This environment variable is a beta feature, and should not be your only safeguard in production environments.</p>
<p>In the event that Langflow could execute untrusted or LLM-generated code, run Langflow in an isolated and containerized execution environment.</p>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="restrict-custom-components-to-superusers">Restrict custom component creation to superusers<a href="#restrict-custom-components-to-superusers" class="hash-link" aria-label="Direct link to Restrict custom component creation to superusers" title="Direct link to Restrict custom component creation to superusers" translate="no">​</a></h3>
<p>To restrict custom component creation to superusers while keeping built-in components functional for users, set the following <a class="" href="/environment-variables">environment variable</a>:</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_CUSTOM_COMPONENT_ADMIN_ONLY=true</span></div></div><br></code></div></div>
<p>When set to <code>true</code>, non-superusers can still view and use custom components in flows, but they cannot create new custom components or edit custom component code.</p>
<h2 class="anchor anchorTargetStickyNavbar_Vzrq" id="configure-a-custom-component-allow-list">Configure a custom component allow-list<a href="#configure-a-custom-component-allow-list" class="hash-link" aria-label="Direct link to Configure a custom component allow-list" title="Direct link to Configure a custom component allow-list" translate="no">​</a></h2>
<p><code>LANGFLOW_ALLOW_CUSTOM_COMPONENTS</code> works together with optional paths that define which component templates the server loads, and which code hashes are trusted.</p>
<p>Directories listed in the <code>LANGFLOW_COMPONENTS_PATH</code> environment variable are loaded as custom components and merged into the server’s template set.
When <code>LANGFLOW_ALLOW_CUSTOM_COMPONENTS</code> is set to <code>false</code>, the components in the <code>LANGFLOW_COMPONENTS_PATH</code> directory <strong>remain allowed</strong>.</p>
<p>To allow some components while blocking others, include the allowed custom components directory in <code>LANGFLOW_COMPONENTS_PATH</code> and set <code>LANGFLOW_ALLOW_CUSTOM_COMPONENTS</code> to <code>false</code>.</p>
<p><code>LANGFLOW_COMPONENTS_INDEX_PATH</code> points to a prebuilt component index JSON file at a local path or <code>http://</code> / <code>https://</code> URL.
This environment variable replaces the default index bundled with the <code>lfx</code> package.
It does <strong>not</strong> import Python modules from a directory on disk.
To allow-list custom components, use the <code>LANGFLOW_COMPONENTS_PATH</code> environment variable.</p>
<p>If both environment variables are set, Langflow builds one combined set of components from the custom index <em>and</em> from <code>LANGFLOW_COMPONENTS_PATH</code>. If the same component category name exists in both, <code>LANGFLOW_COMPONENTS_PATH</code> replaces that whole category from the custom index.</p>
<h3 class="anchor anchorTargetStickyNavbar_Vzrq" id="disable-the-allow-list-bypass">Disable the allow-list bypass<a href="#disable-the-allow-list-bypass" class="hash-link" aria-label="Direct link to Disable the allow-list bypass" title="Direct link to Disable the allow-list bypass" translate="no">​</a></h3>
<p>The allow-list behavior above assumes the admin controls which env vars are set at startup. In deployments where that assumption doesn&#x27;t hold, set:</p>
<div class="ch-codeblock not-prose" data-ch-theme="github-dark"><div class="ch-code-wrapper ch-code" data-ch-measured="false"><code class="ch-code-scroll-parent"><br><div><span class="ch-code-line-number">_<!-- -->10</span><div style="display:inline-block;margin-left:16px"><span>LANGFLOW_ALLOW_COMPONENTS_PATHS_OVERRIDE=false</span></div></div><br></code></div></div>
<p>When this is <code>false</code> <strong>and</strong> <code>LANGFLOW_ALLOW_CUSTOM_COMPONENTS=false</code>, components contributed by <code>LANGFLOW_COMPONENTS_PATH</code> and <code>LANGFLOW_COMPONENTS_INDEX_PATH</code> are ignored and no longer bypass the block.</p>
<p>Default is <code>true</code>, which preserves existing behavior. The setting has no effect while <code>LANGFLOW_ALLOW_CUSTOM_COMPONENTS=true</code>, since nothing is being bypassed.</p>
<p>For more information, see:</p>
<ul>
<li class=""><a class="" href="/environment-variables#visual-editor-and-playground-behavior">Environment variables</a></li>
<li class=""><a class="" href="/security">Security</a></li>
</ul></div></article><nav class="docusaurus-mt-lg pagination-nav" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/lfx-compatibility"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">LFX and Langflow version compatibility</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/security"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Security</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#restrict-custom-components-to-superusers" class="table-of-contents__link toc-highlight">Restrict custom component creation to superusers</a></li><li><a href="#configure-a-custom-component-allow-list" class="table-of-contents__link toc-highlight">Configure a custom component allow-list</a><ul><li><a href="#disable-the-allow-list-bypass" class="table-of-contents__link toc-highlight">Disable the allow-list bypass</a></li></ul></li></ul></div></div></div></div></main></div></div></div><footer class="theme-layout-footer footer"><div class="container container-fluid"><div class="row footer__links"><div class="theme-layout-footer-column col footer__col"><div class="footer__title"></div><ul class="footer__items clean-list"><li class="footer__item"><div class="footer-links">
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