ghsa-qpr4-c339-7vq8
Vulnerability from github
Published
2025-09-04 19:24
Modified
2025-09-05 16:10
Summary
Server-Side Request Forgery via /_image endpoint in Astro Cloudflare adapter
Details

Summary

When using Astro's Cloudflare adapter (@astrojs/cloudflare) configured with output: 'server' while using the default imageService: 'compile', the generated image optimization endpoint doesn't check the URLs it receives, allowing content from unauthorized third-party domains to be served.

Details

On-demand rendered sites built with Astro include an /_image endpoint, which returns optimized versions of images.

The /_image endpoint is restricted to processing local images bundled with the site and also supports remote images from domains the site developer has manually authorized (using the image.domains or image.remotePatterns options).

However, a bug in impacted versions of the @astrojs/cloudflare adapter for deployment on Cloudflare’s infrastructure, allows an attacker to bypass the third-party domain restrictions and serve any content from the vulnerable origin.

PoC

  1. Create a new minimal Astro project (astro@5.13.3)

  2. Configure it to use the Cloudflare adapter (@astrojs/cloudflare@12.6.5) and server output:

```js // astro.config.mjs import { defineConfig } from 'astro/config'; import cloudflare from '@astrojs/cloudflare';

export default defineConfig({ output: 'server', adapter: cloudflare(), }); ```

  1. Deploy to Cloudflare Pages or Workers

  2. Append /_image?href=https://placehold.co/600x400 to the deployment URL.

  3. This will serve the placeholder image from the unauthorised placehold.co domain.

Impact

Allows a non-authorized third-party to create URLs on an impacted site’s origin that serve unauthorized content. This includes the risk of server-side request forgery (SSRF) and by extension cross-site scripting (XSS) if a user follows a link to a maliciously crafted URL.

Show details on source website


{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@astrojs/cloudflare"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.3"
            },
            {
              "fixed": "12.6.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-58179"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-09-04T19:24:11Z",
    "nvd_published_at": "2025-09-05T00:15:32Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nWhen using Astro\u0027s Cloudflare adapter (`@astrojs/cloudflare`) configured with `output: \u0027server\u0027` while using the default `imageService: \u0027compile\u0027`, the generated image optimization endpoint doesn\u0027t check the URLs it receives, allowing content from unauthorized third-party domains to be served.\n\n### Details\n\nOn-demand rendered sites built with Astro include an `/_image` endpoint, which returns optimized versions of images.\n\nThe `/_image` endpoint is restricted to processing local images bundled with the site and also supports remote images from domains the site developer has manually authorized (using the [`image.domains`](https://docs.astro.build/en/reference/configuration-reference/#imagedomains) or [`image.remotePatterns`](https://docs.astro.build/en/reference/configuration-reference/#imageremotepatterns) options).\n\nHowever, a bug in impacted versions of the `@astrojs/cloudflare` adapter for deployment on Cloudflare\u2019s infrastructure, allows an attacker to bypass the third-party domain restrictions and serve any content from the vulnerable origin.\n\n### PoC\n\n1. Create a new minimal Astro project (`astro@5.13.3`)\n\n2. Configure it to use the Cloudflare adapter (`@astrojs/cloudflare@12.6.5`) and server output:\n\n   ```js\n   // astro.config.mjs\n   import { defineConfig } from \u0027astro/config\u0027;\n   import cloudflare from \u0027@astrojs/cloudflare\u0027;\n\n   export default defineConfig({\n     output: \u0027server\u0027,\n     adapter: cloudflare(),\n   });\n   ```\n\n3. Deploy to Cloudflare Pages or Workers\n\n4. Append `/_image?href=https://placehold.co/600x400` to the deployment URL.\n\n7. This will serve the placeholder image from the unauthorised `placehold.co` domain.\n\n### Impact\n\nAllows a non-authorized third-party to create URLs on an impacted site\u2019s origin that serve unauthorized content. This includes the risk of server-side request forgery (SSRF) and by extension cross-site scripting (XSS) if a user follows a link to a maliciously crafted URL.",
  "id": "GHSA-qpr4-c339-7vq8",
  "modified": "2025-09-05T16:10:42Z",
  "published": "2025-09-04T19:24:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/withastro/astro/security/advisories/GHSA-qpr4-c339-7vq8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58179"
    },
    {
      "type": "WEB",
      "url": "https://github.com/withastro/astro/commit/9ecf3598e2b29dd74614328fde3047ea90e67252"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/withastro/astro"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Server-Side Request Forgery via /_image endpoint in Astro Cloudflare adapter"
}


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