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.
Metrics
Affected Vendors & Products
References
History
Wed, 25 Mar 2026 22:00:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Astro
Astro \@astrojs\/node |
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| CPEs | cpe:2.3:a:astro:\@astrojs\/node:*:*:*:*:*:node.js:*:* | |
| Vendors & Products |
Astro
Astro \@astrojs\/node |
Wed, 25 Mar 2026 12:00:00 +0000
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| First Time appeared |
Withastro
Withastro astro |
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| Vendors & Products |
Withastro
Withastro astro |
Tue, 24 Mar 2026 21:15:00 +0000
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| Metrics |
ssvc
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Tue, 24 Mar 2026 19:00:00 +0000
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| 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. | |
| Title | Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands | |
| Weaknesses | CWE-770 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-03-24T18:38:02.733Z
Updated: 2026-03-24T20:17:11.483Z
Reserved: 2026-03-04T16:26:02.897Z
Link: CVE-2026-29772
Updated: 2026-03-24T20:16:33.223Z
Status : Analyzed
Published: 2026-03-24T19:16:51.153
Modified: 2026-03-25T21:48:16.560
Link: CVE-2026-29772
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