CVE-2026-27729— Astro has memory exhaustion DoS due to missing request body size limit in Server Actions

Astro has memory exhaustion DoS due to missing request body size limit in Server Actions

Astro is a web framework. In versions 9.0.0 through 9.5.3, Astro server actions have no default request body size limit, which can lead to memory exhaustion DoS. A single large POST to a valid action endpoint can crash the server process on memory-constrained deployments. On-demand rendered sites built with Astro can define server actions, which automatically parse incoming request bodies (JSON or FormData). The body is buffered entirely into memory with no size limit — a single oversized request is sufficient to exhaust the process heap and crash the server. Astro's Node adapter (`mode: 'standalone'`) creates an HTTP server with no body size protection. In containerized environments, the crashed process is automatically restarted, and repeated requests cause a persistent crash-restart loop. Action names are discoverable from HTML form attributes on any public page, so no authentication is required. The vulnerability allows unauthenticated denial of service against SSR standalone deployments using server actions. A single oversized request crashes the server process, and repeated requests cause a persistent crash-restart loop in containerized environments. Version 9.5.4 contains a fix.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

不加限制或调节的资源分配

Astro 安全漏洞

Astro是Astro开源的一个内容驱动网站的 web 框架。 Astro 9.0.0版本至9.5.3版本存在安全漏洞，该漏洞源于Astro服务器操作没有默认的请求主体大小限制，可能导致内存耗尽拒绝服务，单个大型POST请求到有效的操作端点可能使内存受限部署中的服务器进程崩溃。

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