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CVE-2026-23897— Apollo Server is vulnerable to denial of service with `startStandaloneServer`

Quick assessment

Affected
apollographql apollo-server
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.

@apollo/server是Apollo GraphQL开源的一个JS代码包。 @apollo/server 3.13.0之前版本、4.13.0之前版本和5.4.0之前版本存在安全漏洞，该漏洞源于默认配置对特殊字符集编码请求处理不当，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.70% · P51

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-23897

Vulnerability Information
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Vulnerability Title
Apollo Server is vulnerable to denial of service with `startStandaloneServer`
Source: CVE Program / CVE List V5
Vulnerability Description
Apollo Server is an open-source, spec-compliant GraphQL server that's compatible with any GraphQL client, including Apollo Client. In versions from 2.0.0 to 3.13.0, 4.2.0 to before 4.13.0, and 5.0.0 to before 5.4.0, the default configuration of startStandaloneServer from @apollo/server/standalone is vulnerable to denial of service (DoS) attacks through specially crafted request bodies with exotic character set encodings. This issue does not affect users that use @apollo/server as a dependency for integration packages, like @as-integrations/express5 or @as-integrations/next, only direct usage of startStandaloneServer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
@apollo/server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
@apollo/server是Apollo GraphQL开源的一个JS代码包。 @apollo/server 3.13.0之前版本、4.13.0之前版本和5.4.0之前版本存在安全漏洞，该漏洞源于默认配置对特殊字符集编码请求处理不当，可能导致拒绝服务攻击。
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
apollographql apollo-server >= 2.0.0, <= 3.13.0 -

II. Public POCs for CVE-2026-23897

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III. Intelligence Information for CVE-2026-23897

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Vendor Advisories for CVE-2026-23897 (1)

IV. Related Vulnerabilities

Same vendor: apollographql
Same weakness: CWE-1333

V. Comments for CVE-2026-23897

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