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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-mp6q-xf9x-fwf7 Apollo Serve vulnerable to Denial of Service with `startStandaloneServer`
Fixes

Solution

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Workaround

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History

Wed, 04 Feb 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 04 Feb 2026 19:30:00 +0000

Type Values Removed Values Added
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.
Title Apollo Server is vulnerable to denial of service with `startStandaloneServer`
Weaknesses CWE-1333
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-04T19:55:22.294Z

Reserved: 2026-01-16T21:02:02.903Z

Link: CVE-2026-23897

cve-icon Vulnrichment

Updated: 2026-02-04T19:55:15.426Z

cve-icon NVD

Status : Received

Published: 2026-02-04T20:16:05.130

Modified: 2026-02-04T20:16:05.130

Link: CVE-2026-23897

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses