Preliminary research

Astro full-read SSRF: Host validation and prerendered error-page fetching

Jorian Woltjer · Aikido Security

AI-collected research leads through 6 October 2026, including bounded month-by-month reviews of selected social and community sources from January through September. Unranked, incomplete, not community-vetted, and subject to change.

Traces a full-read SSRF through Astro’s server-side fetching of prerendered custom error pages. Host-derived URLs and uneven validation of Host and forwarded-host headers expose internal responses in a particular hybrid rendering configuration. The article supplies setup and debugging details for this overlooked self-fetch boundary.

Record

Researcher

Jorian Woltjer

Published by

Aikido Security

In the archive

• Collected in the 2026 preliminary research sweep

Related sources

• Vendor security advisory

Tags

• ssrf
• header-injection
• http
• case-study
• owasp-a03-2021
• owasp-a10-2021

This page is the archive's own catalogue record. The research is the work of Jorian Woltjer, first published at the original source. Preserved copies are kept so the citation survives its host.