EUVD-2026-14962
GHSA-3rmj-9m5h-8fpv
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4Tags
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.
Analysis
Astro web framework versions prior to 10.0.0 contain an unbounded JSON parsing vulnerability in the Server Islands POST handler that allows unauthenticated remote attackers to exhaust server memory and cause denial of service. The vulnerability affects all Astro SSR applications using the Node standalone adapter, regardless of whether Server Islands functionality is actually used, because the request body is parsed before route validation occurs. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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