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

Quick assessment

Affected
withastro astro
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 5.9 · Medium EPSS 0.78% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-27729

Vulnerability Information
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Vulnerability Title
Astro has memory exhaustion DoS due to missing request body size limit in Server Actions
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Astro 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
withastro astro >= 9.0.0, < 9.5.4 -

II. Public POCs for CVE-2026-27729

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III. Intelligence Information for CVE-2026-27729

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IV. Related Vulnerabilities

Same product: astro
Same vendor: withastro
Same weakness: CWE-770

V. Comments for CVE-2026-27729

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