CVE-2025-55303 – @astrojs/node

Package

Manager: npm
Name: @astrojs/node
Vulnerable Version: >=0 <9.1.1

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

EPSS: 0.00062 pctl0.19559

Details

Astro allows unauthorized third-party images in _image endpoint ### Summary In affected versions of `astro`, the image optimization endpoint in projects deployed with on-demand rendering allows images 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`](https://docs.astro.build/en/reference/configuration-reference/#imagedomains) or [`image.remotePatterns`](https://docs.astro.build/en/reference/configuration-reference/#imageremotepatterns) options). However, a bug in impacted versions of `astro` allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. `/_image?href=//example.com/image.png`. ### Proof of Concept 1. Create a new minimal Astro project (`astro@5.13.0`). 2. Configure it to use the Node adapter (`@astrojs/node@9.1.0` — newer versions are not impacted): ```js // astro.config.mjs import { defineConfig } from 'astro/config'; import node from '@astrojs/node'; export default defineConfig({ adapter: node({ mode: 'standalone' }), }); ``` 3. Build the site by running `astro build`. 4. Run the server, e.g. with `astro preview`. 5. Append `/_image?href=//placehold.co/600x400` to the preview URL, e.g. <http://localhost:4321/_image?href=//placehold.co/600x400> 6. The site will serve the image from the unauthorized `placehold.co` origin. ### Impact Allows a non-authorized third-party to create URLs on an impacted site’s origin that serve unauthorized image content. In the case of SVG images, this could include the risk of cross-site scripting (XSS) if a user followed a link to a maliciously crafted SVG.

Metadata

Created: 2025-08-19T15:40:31Z
Modified: 2025-08-19T21:41:46Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-xf8x-j4p2-f749/GHSA-xf8x-j4p2-f749.json
CWE IDs: ["CWE-79"]
Alternative ID: GHSA-xf8x-j4p2-f749
Finding: F008
Auto approve: 1