Vulnerability Description
Astro is a web framework. Prior to version 10.0.0, Astro's Server Islands POST handler buffers and parses the full request body as JSON without enforcing a size limit. Because JSON.parse() allocates a V8 heap object for every element in the input, a crafted payload of many small JSON objects achieves ~15x memory amplification (wire bytes to heap bytes), allowing a single unauthenticated request to exhaust the process heap and crash the server. The /_server-islands/[name] route is registered on all Astro SSR apps regardless of whether any component uses server:defer, and the body is parsed before the island name is validated, so any Astro SSR app with the Node standalone adapter is affected. This issue has been patched in version 10.0.0.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Astro | \@Astrojs\/Node | >= 9.0.0, < 10.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/withastro/astro/security/advisories/GHSA-3rmj-9m5h-8fpvExploitVendor Advisory
FAQ
What is CVE-2026-29772?
CVE-2026-29772 is a vulnerability with a CVSS score of 5.9 (MEDIUM). Astro is a web framework. Prior to version 10.0.0, Astro's Server Islands POST handler buffers and parses the full request body as JSON without enforcing a size limit. Because JSON.parse() allocates a...
How severe is CVE-2026-29772?
CVE-2026-29772 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-29772?
Check the references section above for vendor advisories and patch information. Affected products include: Astro \@Astrojs\/Node.