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TI-2026-20654 Aliases CVE-2026-25545GHSA-qq67-mvv5-fw3g

Astro has Full-Read SSRF in error rendering via Host: header injection

Priority MEDIUM 64CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01933 80th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed astro (withastro): 9.5.4@astrojs/node (npm): 9.5.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
withastroastrobefore 9.5.49.5.4Patch availableCNA
—@astrojs/node (npm)before 9.5.49.5.4Patch availableGHSA-qq67-mvv5-fw3g
  • astro Vendorwithastro Affected before 9.5.4 Fixed in 9.5.4 Patch available CNA
  • @astrojs/node (npm) Vendor— Affected before 9.5.4 Fixed in 9.5.4 Patch available GHSA-qq67-mvv5-fw3g

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:astro:\@astrojs\/node:*:*:*:*:*:node.js:*:*before 9.5.4Vulnerablewithastro
  • cpe:2.3:a:astro:\@astrojs\/node:*:*:*:*:*:node.js:*:* Versions before 9.5.4 Vulnerable ·withastro

Remediation

  • Fix · CNA astro (withastro) Fixed in 9.5.4
  • Fix · GHSA-qq67-mvv5-fw3g @astrojs/node (npm) Fixed in 9.5.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-25545
  2. 2026-10-03 Alias added: GHSA-qq67-mvv5-fw3g

References

Exploit 1

Patch 1

Advisory 1

Other 3

  • TI-2026-23358 Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands CVSS 3.1HIGH 7.5
  • TI-2026-22091 Astro has memory exhaustion DoS due to missing request body size limit in Server Actions CVSS 3.1HIGH 7.5
  • TI-2026-22180 Astro is vulnerable to SSRF due to missing allowlist enforcement in remote image inferSize CVSS 3.1HIGH 7.2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences