Critical severity · published Mar 24, 2026
CVE-2026-33768
Astro: Unauthenticated Path Override via `x-astro-path` / `x_astro_path`
9.1
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
astro · withastro
< 10.0.2 · source: vendor
AS
@astrojs/vercel · Astro
before 10.0.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33768
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33768
Patch
https://github.com/withastro/astro/commit/335a204161f5a7293c128db570901d4f8639c6ed
Issue Tracking
https://github.com/withastro/astro/pull/15959
Release Notes
https://github.com/withastro/astro/releases/tag/%40astrojs%2Fvercel%4010.0.2
Exploit
https://github.com/withastro/astro/security/advisories/GHSA-mr6q-rp88-fx84
More from astro
8.6
CVE-2026-25545
Astro has Full-Read SSRF in error rendering via Host: header injection
8.2
CVE-2026-102984
Astro: Malformed port in the Host header can crash the Node adapter
8.2
CVE-2026-59731
Astro 6.4.7 Authorization Bypass via Decode Iteration Limit and Rewrite Path Canonicalization Mismatch
7.5
CVE-2026-54299
Astro: Host-header full-read SSRF in core prerendered error-page fetch (prerenderedErrorPageFetch default + unvalidated createRequestFromNodeRequest URL)
7.5
CVE-2026-29772
Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands