Unauthorized third-party images in Astro’s _image endpoint_CVE-2025-55303

6.9 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

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.

Basic Information

ID CVE-2025-55303

Source GitHub_M

Published Aug 19, 2025 at 18:08

Affected Product

Vendor withastro

Product astro

Version >= 5.0.0-alpha.0, < 5.13.2

Affected Versions withastro astro >= 5.0.0-alpha.0, < 5.13.2
withastro astro < 4.16.18

CWE Classification

CWE-79 CWE-115

References

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    "published": "2025-08-19T18:08:00.244Z",
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