CVE-2025-55303 – Astro Image Optimization Endpoint Protocol-Relative URL Injection

CVE ID : CVE-2025-55303

Published : Aug. 19, 2025, 7:15 p.m. | 59 minutes ago

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.

Severity: 6.9 | MEDIUM

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