Denial of Service Vulnerability in Apollo Server by Apollo GraphQL
CVE-2026-23897

7.5HIGH

Key Information:

Vendor

Apollographql

Status
Apollo-server
Vendor
CVE Published:
4 February 2026

What is CVE-2026-23897?

Apollo Server versions 2.0.0 through 3.13.0, 4.2.0 through before 4.13.0, and 5.0.0 through before 5.4.0 are susceptible to denial of service (DoS) attacks. This issue arises when the default configuration of the startStandaloneServer function from @apollo/server/standalone is utilized with specially crafted request bodies that exploit unusual character set encodings. Notably, this vulnerability does not impact those using @apollo/server as a dependency for integration packages, such as @as-integrations/express5 or @as-integrations/next.

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Affected Version(s)

apollo-server >= 2.0.0, <= 3.13.0 <= 2.0.0, 3.13.0

apollo-server >= 4.2.0, < 4.13.0 < 4.2.0, 4.13.0

apollo-server >= 5.0.0, < 5.4.0 < 5.0.0, 5.4.0

References

https://github.com/apollographql/apollo-server/security/a...
x_refsource_CONFIRM
https://github.com/apollographql/apollo-server/commit/d25...
x_refsource_MISC
https://github.com/apollographql/apollo-server/commit/e9d...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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