CVE-2026-23897
High · 7.5CVSS
7.5
EPSS
0.7%
Published
Feb 4, 2026
CISA due date
—
The record
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
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | @apollo/server | 4.2.0 | 4.13.0 |
| npm | @apollo/server | 5.0.0 | 5.4.0 |
| npm | apollo-server | 2.0.0 | No fix |
Related vulnerabilities
- GHSA-mp6q-xf9x-fwf7 Apollo Serve vulnerable to Denial of Service with `startStandaloneServer` Same vulnerability
- GHSA-9q82-xgwf-vj6h Apollo Server: Browser bug allows for bypass of XS-Search (read-only Cross-Site Request… Also affects @apollo/server
- CVE-2026-112901 Pillow is a Python imaging library. CWE-1333
- CVE-2026-106454 Twisted is an event-based framework for internet applications, supporting Python 3.6+. CWE-1333
- CVE-2026-77387 geopy is a geocoding library for Python. CWE-1333
- CVE-2026-102990 basic-ftp is an FTP client for Node.js. CWE-1333
- CVE-2026-102473 A flaw was found in dash. CWE-1333
- CVE-2026-102270 PyJWT is a Python implementation of JSON Web Token standards. CWE-1333