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EUVD-2026-271304

fkie_cve-2026-27829

Astro is a web framework. In versions 9.0.0 through 9.5.3, a bug in Astro's image pipeline allows bypassing `image.domains` / `image.remotePatterns` restrictions, enabling the server to fetch content from unauthorized remote hosts. Astro provides an `inferSize` option that fetches remote images at render time to determine their dimensions. Remote image fetches are intended to be restricted to domains the site developer has manually authorized (using the `image.domains` or `image.remotePatterns` options). However, when `inferSize` is used, no domain validation is performed — the image is fetched from any host regardless of the configured restrictions. An attacker who can influence the image URL (e.g., via CMS content or user-supplied data) can cause the server to fetch from arbitrary hosts. This allows bypassing `image.domains` / `image.remotePatterns` restrictions to make server-side requests to unauthorized hosts. This includes the risk of server-side request forgery (SSRF) against internal network services and cloud metadata endpoints. Version 9.5.4 fixes the issue.

GHSA-cj9f-h6r6-4cx2 — Astro is vulnerable to SSRF due to missing allowlist enforcement in remote image inferSize

Affected: npm: @astrojs/node

## Summary

A bug in Astro's image pipeline allows bypassing `image.domains` / `image.remotePatterns` restrictions, enabling the server to fetch content from unauthorized remote hosts.

## Details

Astro provides an `inferSize` option that fetches remote images at render time to determine their dimensions. Remote image fetches are intended to be restricted to domains the site developer has manually authorized (using the `image.domains` or `image.remotePatterns` options).

However, when `inferSize` is used, no domain validation is performed — the image is fetched from any host regardless of the configured restrictions. An attacker who can influence the image URL (e.g., via CMS content or user-supplied data) can cause the server to fetch from arbitrary hosts.

## PoC

### Setup

Create a new Astro project with the following files:

`package.json`: ```json { "name": "poc-ssrf-infersize", "private": true, "scripts": { "dev": "astro dev --port 4322", "build": "astro build" }, "dependencies": { "astro": "5.17.2", "@astrojs/node": "9.5.3" } } ```

`astro.config.mjs` — only `localhost:9000` is authorized: ```javascript import { defineConfig } from 'astro/config'; import node from '@astrojs/node';

export default defineConfig({ output: 'server', adapter: node({ mode: 'standalone' }), image: { remotePatterns: [ { hostname: 'localhost', port: '9000' } ] } }); ```

`internal-service.mjs` — simulates an internal service on a no…