CVE-2026-41067: Astro

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Astro is a web framework. Prior to 6.1.6, the defineScriptVars function in Astro's server-side rendering pipeline uses a case-sensitive regex /<\/script>/g to sanitize values injected into inline <script> tags via the define:vars directive. HTML parsers close <script> elements case-insensitively and also accept whitespace or / before the closing >, allowing an attacker to bypass the sanitization with payloads like </Script>, </script >, or </script/> and inject arbitrary HTML/JavaScript. This vulnerability is fixed in 6.1.6.

Affected products

• Astro Astro: before 6.1.6 (fixed in 6.1.6)

Published 2026-04-24. Last modified 2026-06-17.