CVE-2025-59837 astro allows bypass of image proxy domain validation leading to SSRF and potential XSS
Attackers can bypass image proxy validation to perform SSRF and potentially XSS, requiring an upgrade to the Astro framework.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-59837?
CVE-2025-59837 is a high-severity server-side request forgery vulnerability in withastro astro, published on 28 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Astro is a web framework that includes an image proxy. In versions 5.13.4 and later before 5.13.10, the image proxy domain validation can be bypassed by using backslashes in the href parameter, allowing server-side requests to arbitrary URLs. This can lead to server-side request forgery (SSRF) and potentially cross-site scripting (XSS). This vulnerability exists due to an incomplete fix for CVE-2025-58179. Fixed in 5.13.10.
Which versions are affected by CVE-2025-59837?
2 open source packages ship an affected version, including astro. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
astro npm | From 5.13.4 | 5.13.10 |
astro npm | From 5.13.4 | 5.13.10 |
Products include Astro Astro.
How do I fix CVE-2025-59837?
Upgrade astro to 5.13.10 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2025-59837 being exploited?
There is no known exploitation of CVE-2025-59837 in the wild and no public exploit code.
Other vulnerabilities in withastro astro
- CVE-2024-56159 Server source code is exposed to the public if sourcemaps are enabled
- CVE-2026-54299 Astro: Host header SSRF in prerendered error page fetch
- CVE-2026-50146 Astro: Reflected XSS via unescaped slot name
- CVE-2025-64764 Astro is vulnerable to Reflected XSS via the server islands feature
- CVE-2025-64765 Astro middleware authentication checks based on url.pathname can be bypassed via url encoded values
Sources
Also known as GHSA-qcpr-679q-rhm2.