Astro's server source code is exposed to the public if sourcemaps are enabled

Description

A bug in the build process allows any unauthenticated user to read parts of the server source code.

Recommendation

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

• Affected version(s): **>= 5.0.0-alpha.0, < 5.0.8

  <= 4.16.17**

• Patched version(s): **5.0.8

  4.16.18**

References

• GHSA-49w6-73cw-chjr
• CVE-2024-56159
• CWE-219
• CAPEC-310
• OWASP 2021-A1
• OWASP 2021-A6

Related Issues

• Astro Cloudflare adapter has Stored Cross-site Scripting vulnerability in /_image endpoint - CVE-2025-65019
• 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
• Astros's duplicate trailing slash feature leads to an open redirection security issue - CVE-2025-54793

Tags:

npm

astro