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TI-2026-39195 Aliases CVE-2026-54299GHSA-2pvr-wf23-7pc7

Improper input validation in withastro astro

Priority LOW 33CWE-20Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Astro is a web framework. Prior to 6.4.6, Astro SSR apps with prerendered error pages (/404 or /500 using export const prerender = true) fetch those pages over HTTP at runtime when an error occurs. The URL for this fetch is derived from request.url, which in turn gets its origin from the incoming Host header. When the Host header is not validated against allowedDomains, an attacker can point the fetch at an arbitrary host and read the response. This vulnerability is fixed in 6.4.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00333 26th percentileScored 2026-11-07
Fix Fixed astro (withastro): 6.4.6astro (npm): 6.4.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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 6.4.66.4.6Patch availableCNA
—astro (npm)before 6.4.66.4.6Patch availableGHSA-2pvr-wf23-7pc7
  • astro Vendorwithastro Affected before 6.4.6 Fixed in 6.4.6 Patch available CNA
  • astro (npm) Vendor— Affected before 6.4.6 Fixed in 6.4.6 Patch available GHSA-2pvr-wf23-7pc7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*before 6.4.6Vulnerablewithastro
  • cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:* Versions before 6.4.6 Vulnerable ·withastro

Remediation

  • Fix · CNA astro (withastro) Fixed in 6.4.6
  • Fix · GHSA-2pvr-wf23-7pc7 astro (npm) Fixed in 6.4.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54299
  2. 2026-10-03 Alias added: GHSA-2pvr-wf23-7pc7

References

Advisory 2

Other 1

  • TI-2024-37142 Server source code is exposed to the public if sourcemaps are enabled CVSS 4.0HIGH 7.8
  • TI-2025-34958 Unauthorized third-party images in Astro’s _image endpoint CVSS 4.0MEDIUM 6.9
  • TI-2025-39915 Server-side request forgery in withastro astro CVSS 3.1MEDIUM 6.5
  • TI-2025-38274 Astro's `X-Forwarded-Host` is reflected with no validation CVSS 3.1MEDIUM 6.5
  • TI-2026-36915 Astro: Reflected XSS via unescaped slot name CVSS 3.1HIGH 7.1
  • TI-2025-40102 Astro is vulnerable to Reflected XSS via the server islands feature CVSS 3.1HIGH 7.1
See all 19 →

Sources

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