Server-side Request Forgery (SSRF) Affecting astro package, versions <6.4.6
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Server-side Request Forgery (SSRF) vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JS-ASTRO-17356189
- published17 Jun 2026
- disclosed16 Jun 2026
- credit5ud0er - Tarmo Technologies, Matthew Phillips
Introduced: 16 Jun 2026
NewCVE-2026-54299 (opens in a new tab)How to fix?
Upgrade astro to version 6.4.6 or higher.
Overview
astro is an Astro is a modern site builder with web best practices, performance, and DX front-of-mind.
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) via the prerenderedErrorPageFetch. An attacker can access sensitive information or interact with internal resources by sending a crafted request with a malicious Host header, which causes the server to fetch error pages from an attacker-controlled host and reflect the response back to the client.
Note: This is only exploitable if the deployment uses prerendered error pages and the internal createRequestFromNodeRequest builder with app.render() without overriding the default error page fetch behavior.