CVE-2026-23897
HIGH EPSS 45.6%
Published Feb 4, 20264mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
Published Feb 4, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
45.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-1333
Affected Products 3
| Vendor | Product | Version | Range |
|---|---|---|---|
| apollographql | apollo_server | * | ≥2.0.0 – ≤3.13.0 |
| apollographql | apollo_server | * | ≥4.2.0 – <4.13.0 |
| apollographql | apollo_server | * | ≥5.0.0 – <5.4.0 |
References 3
- github.com https://github.com/apollographql/apollo-server/commit/d25a5bdc377826ad424fcf7f8d1d062055911643
- github.com https://github.com/apollographql/apollo-server/commit/e9d49d163a86b8a33be56ed27c494b9acd5400a4
- github.com https://github.com/apollographql/apollo-server/security/advisories/GHSA-mp6q-xf9x-fwf7
Remediation
- github.com https://github.com/apollographql/apollo-server/commit/d25a5bdc377826ad424fcf7f8d1d062055911643
- github.com https://github.com/apollographql/apollo-server/commit/e9d49d163a86b8a33be56ed27c494b9acd5400a4