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EUVD-2026-277287

2026-10-05T20:46:23.950518+00:00

EUVD-2026-277287

fkie_cve-2026-29772

2026-10-05T20:46:23.950571+00:00

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.

GHSA-3rmj-9m5h-8fpv — Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands

2026-10-05T20:46:23.950612+00:00

Affected: npm: @astrojs/node

### Summary

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.

### Details

Astro automatically registers a Server Islands route at `/_server-islands/[name]` on all SSR apps, regardless of whether any component uses `server:defer`. The POST handler in `packages/astro/src/core/server-islands/endpoint.ts` buffers the entire request body into memory and parses it as JSON with no size or depth limit:

```js // packages/astro/src/core/server-islands/endpoint.ts (lines 55-56) const raw = await request.text(); // full body buffered into memory — no size limit const data = JSON.parse(raw); // parsed into V8 object graph — no element count limit ```

The request body is parsed before the island name is validated, so the attacker does not need to know any valid island name — `/_server-islands/anything` triggers the vulnerable code path. No authentication is required.

Additionally…