Image Optimization Vulnerability in Astro Web Framework by Astro
CVE-2025-55303

6.9MEDIUM

Key Information:

Vendor

Withastro

Status
Astro
Vendor
CVE Published:
19 August 2025

What is CVE-2025-55303?

The Astro web framework has a security flaw that affects its image optimization feature. This issue arises when on-demand rendering is utilized, allowing an attacker to exploit the /_image endpoint, which serves optimized images. In versions prior to 5.13.2 and 4.16.18, a bug permits the use of protocol-relative URLs, enabling unauthorized images from third-party domains to be served. This vulnerability exposes websites to potential misuse, emphasizing the need for immediate updates to secure deployed projects.

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Affected Version(s)

astro >= 5.0.0-alpha.0, < 5.13.2 < 5.0.0-alpha.0, 5.13.2

astro < 4.16.18 < 4.16.18

References

https://github.com/withastro/astro/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/withastro/astro/commit/4d16de7f95db5d1...
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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