Astro's `X-Forwarded-Host` is reflected without validation

Description

When running Astro in on-demand rendering mode using a adapter such as the node adapter it is possible to maliciously send an X-Forwarded-Host header that is reflected when using the recommended Astro.url property as there is no validation that the value is safe.

Recommendation

Update the astro package to the latest compatible version. Followings are version details:

• Affected version(s): < 5.14.3
• Patched version(s): 5.14.3

References

• GHSA-5ff5-9fcw-vg88
• CVE-2025-61925
• CWE-20
• CWE-470
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Astro has an Authentication Bypass via Double URL Encoding, a bypass for CVE-2025-64765 - CVE-2025-66202
• Astro's middleware authentication checks based on url.pathname can be bypassed via url encoded values - CVE-2025-64765
• Astro development server error page is vulnerable to reflected Cross-site Scripting - CVE-2025-64745
• Astro allows unauthorized third-party images in _image endpoint - CVE-2025-55303

Tags:

npm

astro