Astro
CVE-2026-25545
HIGH
GHSA-qq67-mvv5-fw3g
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessModify Host header to attacker server
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DeliveryTrigger error page rendering
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ExploitServer fetches attacker's endpoint
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ExecutionAttacker redirects to internal URL
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ImpactServer returns internal response body
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V4 - API and Web Service URL allowlisting, SSRF prevention
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Credential Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Server-Side Rendered pages with prerendered custom error pages (404.astro, 500.astro) in Astro versions before 9.5.4. No Host header validation required, exploitable through direct IP access or proxy bypass. |
| Impact | CVSS 8.6 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitable via remote/network. Public exploit/POC available. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Astro web framework versions prior to 9.5.4 contain a server-side request forgery vulnerability in error page handling that allows unauthenticated remote attackers to bypass Host header validation and redirect requests to internal services or cloud metadata endpoints. By manipulating the Host header when accessing prerendered error pages, attackers can read response bodies from internal URLs, cloud metadata services, or localhost resources. Public exploit code exists for this vulnerability, which affects applications using custom error pages without proper Host validation.
Earlier versions of this analysis (1)
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. [CVSS 8.6 HIGH]
RemediationAI
A vendor patch is available — apply it immediately. Restrict network access to the affected service where possible.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in npm
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-918 (Server-Side Request Forgery (SSRF)). Affects \@Astrojs\/Node. 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 behi
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
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.
Executive ViewAI
CVE-2026-25545 affects Astro web framework versions prior to 9.5.4 and impacts organizations using Server-Side Rendered pages with custom error handling. With a high CVSS score of 8.6, public exploits available, and active threat potential, immediate patching is critical to prevent unauthorized access or data exposure through error page vulnerabilities.
Apply vendor patch.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Server-Side Request Forgery exploits applications that fetch remote resources based on user-supplied URLs.
Affected Products (CPE)GitHub Advisory
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Exploit-DB