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CVE-2026-25545— Astro has Full-Read SSRF in error rendering via Host: header injection

Quick assessment

Affected
withastro astro
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Astro是Astro开源的一个内容驱动网站的 web 框架。 Astro 9.5.4之前版本存在代码问题漏洞，该漏洞源于服务端渲染页面在处理错误时存在服务端请求伪造，可能导致攻击者访问内部网络服务。

AI Predicted 8.1 Difficulty: Easy EPSS 1.94% · P79

Public Exploits 1

Nuclei · 1 CVE-2026-25545.yaml [template]

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-25545

Vulnerability Information
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Vulnerability Title
Astro has Full-Read SSRF in error rendering via Host: header injection
Source: CVE Program / CVE List V5
Vulnerability Description
Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page (eg. `404.astro` or `500.astro`) are vulnerable to SSRF. If the `Host:` header is changed to an attacker's server, it will be fetched on `/500.html` and they can redirect this to any internal URL to read the response body through the first request. An attacker who can access the application without `Host:` header validation (eg. through finding the origin IP behind a proxy, or just by default) can fetch their own server to redirect to any internal IP. With this they can fetch cloud metadata IPs and interact with services in the internal network or localhost. For this to be vulnerable, a common feature needs to be used, with direct access to the server (no proxies). Version 9.5.4 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Astro 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Astro是Astro开源的一个内容驱动网站的 web 框架。 Astro 9.5.4之前版本存在代码问题漏洞，该漏洞源于服务端渲染页面在处理错误时存在服务端请求伪造，可能导致攻击者访问内部网络服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
withastro astro < 9.5.4 -

II. Public POCs for CVE-2026-25545

# POC Description Source Link Shenlong Link
1 Astro before 5.17.3 and @astrojs/node before 9.5.4 are vulnerable to full-read SSRF due to improper Host header validation in error page rendering, allowing attackers to redirect requests and access internal resources. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-25545.yaml POC Details
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III. Intelligence Information for CVE-2026-25545

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Vendor Advisories for CVE-2026-25545 (1)

IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-918

V. Comments for CVE-2026-25545

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