CVE-2026-29772
CVE-2026-29772 · Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 5.9 · Medium · EPSS 0.4% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
astro
- Versions
- < 10.0.0: Affected
No fix published
@astrojs/node npm
- Affected ranges
- SEMVER: < 10.0.0
Update to 10.0.0