Web Framework Image Proxy Bypass Issue in Astro by WithAstro
CVE-2025-59837

7.2HIGH

Key Information:

Vendor

Withastro

Status
Astro
Vendor
CVE Published:
28 October 2025

What is CVE-2025-59837?

Astro, a web framework, has an issue with its image proxy that impacts versions 5.13.4 through 5.13.9. The vulnerability arises from an incomplete validation mechanism, allowing attackers to bypass the expected domain checks by exploiting the href parameter with backslashes. This misconfiguration can lead to server-side requests directed to arbitrary URLs, which may result in SSRF vulnerabilities, and potentially facilitate cross-site scripting (XSS) attacks. The issue is mitigated in version 5.13.10.

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Affected Version(s)

astro >= 5.13.4, < 5.13.10

References

https://github.com/withastro/astro/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/withastro/astro/commit/1e2499e8ea83ebf...
x_refsource_MISC
https://github.com/withastro/astro/commit/9ecf3598e2b29dd...
x_refsource_MISC

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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