What’s Vulnerable › Vulnerabilities
CVE-2026-29772: Astro: Memory exhaustion DoS due to missing request body size limit in Server Islands
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-24 · updated 2026-06-17
- Weakness: CWE-770
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.
Affected products
- Astro @Astrojs/Node: from 9.0.0 before 10.0.0 — fixed in 10.0.0
How to fix
Upgrade to a fixed version: Astro @Astrojs/Node 10.0.0. Check the vendor advisory for mitigations.
References
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