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TI-2026-26147 Aliases CVE-2026-33768GHSA-mr6q-rp88-fx84

Astro: Unauthenticated Path Override via `x-astro-path` / `x_astro_path`

Priority HIGH 78CWE-441Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

Astro is a web framework. Prior to version 10.0.2, the @astrojs/vercel serverless entrypoint reads the x-astro-path header and x_astro_path query parameter to rewrite the internal request path, with no authentication whatsoever. On deployments without Edge Middleware, this lets anyone bypass Vercel's platform-level path restrictions entirely. The override preserves the original HTTP method and body, so this isn't limited to GET. POST, PUT, DELETE all land on the rewritten path. A Firewall rule blocking /admin/* does nothing when the request comes in as POST /api/health?x_astro_path=/admin/delete-user. This issue has been patched in version 10.0.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00344 28th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed astro (withastro): 10.0.2@astrojs/vercel (npm): 10.0.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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 10.0.210.0.2Patch availableCNA
—@astrojs/vercel (npm)before 10.0.210.0.2Patch availableGHSA-mr6q-rp88-fx84
  • astro Vendorwithastro Affected before 10.0.2 Fixed in 10.0.2 Patch available CNA
  • @astrojs/vercel (npm) Vendor— Affected before 10.0.2 Fixed in 10.0.2 Patch available GHSA-mr6q-rp88-fx84

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:astro:\@astrojs\/vercel:*:*:*:*:*:*:*:*before 10.0.2Vulnerablewithastro
  • cpe:2.3:a:astro:\@astrojs\/vercel:*:*:*:*:*:*:*:* Versions before 10.0.2 Vulnerable ·withastro

Remediation

  • Fix · CNA astro (withastro) Fixed in 10.0.2
  • Fix · GHSA-mr6q-rp88-fx84 @astrojs/vercel (npm) Fixed in 10.0.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33768
  2. 2026-10-03 Alias added: GHSA-mr6q-rp88-fx84

References

Exploit 1

Patch 1

Advisory 2

Other 4

Sources

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