fix(security): strict mode, deprecate `html` by harlan-zw · Pull Request #545 · nuxt-modules/og-image

harlan-zw · 2026-03-28T05:10:27Z

🔗 Linked issue

Related to GHSA-pqhr-mp3f-hrpp (Server-Side Request Forgery via user-controlled parameters)

❓ Type of change

📚 Description

The html option on defineOgImage() and the html query parameter on /_og/d/ allowed arbitrary HTML injection, which was the primary vector for all three SSRF advisories. This removes the option entirely: the type, the query param decoding, the inline HTML rendering path in vnodes, and the docs.

The browser renderer's internal prerender HTML fetch (which reused options.html as a local cache) is refactored to use a local variable instead.

⚠️ Breaking Changes

defineOgImage({ html: '...' }) no longer works. Use a Vue component instead.

📝 Migration

Replace inline HTML usage with a Vue component in app/components/OgImage/:

<script setup lang="ts">
defineProps<{ title: string }>()
</script>
<template>
  <div>{{ title }}</div>
</template>

pkg-pr-new · 2026-03-28T05:12:47Z

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npm i https://pkg.pr.new/nuxt-og-image@545

commit: 1cfd60e

Copilot

Pull request overview

This PR hardens the OG image runtime endpoint against SSRF by deprecating/removing the inline-HTML rendering surface and introducing a security.strict mode with safer defaults (and a required signing secret).

Changes:

Adds security.strict configuration, enforces security.secret when enabled, and adjusts security defaults (maxQueryParamSize, restrictRuntimeImagesToOrigin).
Strips html from runtime request inputs and adds runtime warnings where html is still present in the rendering pipeline.
Updates documentation to describe strict mode and deprecate inline HTML templates.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/runtime/types.ts	Adds `security.strict` to runtime config types and marks `OgImageOptions.html` as deprecated.
src/runtime/server/og-image/core/vnodes.ts	Warns when `ctx.options.html` is used in vnode creation.
src/runtime/server/og-image/context.ts	Attempts to strip `html` from request-derived inputs; adds strict-mode stripping.
src/runtime/server/og-image/browser/screenshot.ts	Adds deprecation warning and modifies prerender HTML fetch behavior (currently via `options.html`).
src/module.ts	Introduces `security.strict` option, requires `secret` when strict, and sets strict-mode defaults in runtime config.
docs/content/4.api/3.config.md	Documents the new `security.strict` option and example configuration.
docs/content/4.api/0.define-og-image.md	Marks `html` as deprecated but still documents inline HTML template usage.
docs/content/3.guides/13.security.md	Adds strict mode guide content and setup steps (one snippet currently omits required `secret`).

Comments suppressed due to low confidence (2)

src/runtime/server/og-image/browser/screenshot.ts:114

This function mutates options.html to cache prerender HTML (options.html = await e.$fetch(...)). If the goal is to remove the public html option, this reuse makes the option harder to eliminate and can create surprising side effects since options is shared via the render context. Prefer using a local variable (e.g. let prerenderHtml) instead of writing back onto options.

    if (import.meta.prerender && !options.html) {
      // we need to do a nitro fetch for the HTML instead of rendering with browser
      options.html = await e.$fetch(path).catch(() => undefined) as string
    }

docs/content/4.api/0.define-og-image.md:205

Even with the deprecation callout, this section still tells users they “can … inline it using the html option” and provides a working example. That contradicts the PR’s stated breaking change/migration (inline HTML no longer works). Consider removing this example entirely or rewriting it as a migration-only snippet that shows the equivalent Vue component approach.

If you have a simple template and prefer to inline it, you can do so using the `html` option:

```ts
defineOgImage('NuxtSeo', {}, {
  html: `<div class="w-full h-full text-6xl flex justify-end items-end bg-blue-500 text-white">
    <div class="mb-10 underline mr-10">hello world</div>
</div>`,
})

</details>



---

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Copilot · 2026-03-28T06:36:33Z

docs/content/3.guides/13.security.md

  ogImage: {
    security: {
-      secret: process.env.OG_IMAGE_SECRET,
+      strict: true,


The new strict-mode example enables strict: true without also setting secret, but the module now fails the build when security.strict is enabled without security.secret. Update this snippet to include secret: process.env.OG_IMAGE_SECRET (or remove the snippet) so readers don’t copy an invalid configuration.

Suggested change

strict: true,

strict: true,

secret: process.env.OG_IMAGE_SECRET,

Copilot · 2026-03-28T06:36:34Z

src/runtime/server/og-image/core/vnodes.ts

 export async function createVNodes(ctx: OgImageRenderEventContext, options?: CreateVNodesOptions): Promise<VNode> {
  let html = ctx.options.html
+  if (html) {
+    logger.warn('The `html` option is deprecated and will be removed in the next major version. Use a Vue component instead.')
+  }
  if (!html) {


This code path still accepts ctx.options.html and only emits a warning. Given the PR goal (“remove html option to prevent SSRF via inline HTML injection”) and the breaking-change note, it would be safer to fully disable/ignore options.html here (or hard-error in strict mode) rather than continuing to render arbitrary HTML into the vnode pipeline.

Copilot · 2026-03-28T06:36:34Z

src/module.ts

+    if (config.security?.strict && !config.security?.secret) {
+      throw new Error('[nuxt-og-image] `security.strict` requires `security.secret` to be set. Generate one with: npx nuxt-og-image generate-secret')
+    }


The new security.strict behavior (requiring security.secret and changing defaults like maxQueryParamSize / restrictRuntimeImagesToOrigin) isn’t covered by tests in this PR. Since the repo already has unit/e2e coverage for security-related behavior (e.g. URL signing), please add coverage for: (1) build/setup failing when strict: true and secret is missing, and (2) the strict-mode defaulting behavior.

Copilot · 2026-03-28T06:36:34Z

src/runtime/server/og-image/context.ts

+  // Always strip html from query params to prevent SSRF via inline HTML injection
+  delete queryParams.html
+  // In strict mode, also strip html from URL options (disables the feature entirely)
+  if (runtimeConfig.security?.strict) {
+    delete urlOptions.html
+  }


delete queryParams.html happens after queryParams = separateProps(queryParams), and separateProps treats html as an unknown key (so it gets moved under queryParams.props.html). As written, this won’t reliably strip a user-supplied ?html=... value. If the intent is to always drop the parameter, delete it from the raw query object before calling separateProps, or also delete queryParams.props?.html after separation (and consider other encodings like props={...} if relevant).

strict mode requires secret (URL signing), disables html option, defaults maxQueryParamSize to 2048, and enables origin restriction.

- Strip html from query params before separateProps (fixes props.html bypass) - Add unit tests for strict mode config resolution

harlan-zw force-pushed the fix/deprecate-html-param branch from 264ec74 to 99f9c71 Compare March 28, 2026 05:44

harlan-zw requested a review from Copilot March 28, 2026 06:29

Copilot started reviewing on behalf of harlan-zw March 28, 2026 06:29 View session

Copilot AI reviewed Mar 28, 2026

View reviewed changes

fix: add security.strict mode, deprecate html option

a361b75

strict mode requires secret (URL signing), disables html option, defaults maxQueryParamSize to 2048, and enables origin restriction.

harlan-zw force-pushed the fix/deprecate-html-param branch from 20bf586 to a361b75 Compare March 28, 2026 06:48

harlan-zw changed the title ~~fix(security): remove html option to prevent SSRF via inline HTML injection~~ fix(security): strict mode, deprecate html Mar 28, 2026

fix: address review comments on strict mode

1cfd60e

- Strip html from query params before separateProps (fixes props.html bypass) - Add unit tests for strict mode config resolution

harlan-zw merged commit 25c057b into main Mar 28, 2026
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fix(security): strict mode, deprecate `html`#545

fix(security): strict mode, deprecate `html`#545
harlan-zw merged 2 commits intomainfrom
fix/deprecate-html-param

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	strict: true,
	strict: true,
	secret: process.env.OG_IMAGE_SECRET,

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harlan-zw commented Mar 28, 2026

🔗 Linked issue

❓ Type of change

📚 Description

⚠️ Breaking Changes

📝 Migration

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