CVE-2026-23897
February 04, 2026
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.
Affected Packages
https://github.com/apollographql/apollo-server.git (GITHUB):
Affected version(s) >=@apollo/server@4.2.0 <@apollo/server@4.13.0Fix Suggestion:
Update to version @apollo/server@4.13.0https://github.com/apollographql/apollo-server.git (GITHUB):
Affected version(s) >=@apollo/server@5.0.0 <@apollo/server@5.4.0Fix Suggestion:
Update to version @apollo/server@5.4.0@apollo/server (NPM):
Affected version(s) >=5.0.0 <5.4.0Fix Suggestion:
Update to version 5.4.0@apollo/server (NPM):
Affected version(s) >=4.2.0 <4.13.0Fix Suggestion:
Update to version 4.13.0Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Inefficient Regular Expression Complexity
EPSS
Base Score:
0.06
