{"cvss":6.9,"datePublished":"2026-02-12T00:00:00Z","dateUpdated":"2026-02-12T00:00:00Z","description":"Astro is a web framework for content-driven websites. In versions of astro before 5.13.2 and 4.16.18, the image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. On-demand rendered sites built with Astro include an /_image endpoint which returns optimized versions of images. A bug in impacted versions of astro allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. /_image?href=//example.com/image.png. This vulnerability is fixed in 5.13.2 and 4.16.18.","dueDate":"","id":"CVE-2025-55303","kev_catalogs":["vulncheck"],"knownRansomwareCampaignUse":"Unknown","product":"astro","requiredAction":"Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.","severity":"MEDIUM","source":"vulncheck_kev","title":"astro astro Improper Neutralization of Input During Web Page Generation","vendor":"astro"}