Is CVE-2026-23897 actively exploited?

CVE-2026-23897 has no public evidence of in-the-wild exploitation as of 2026-03-18.

What is the CVSS score for CVE-2026-23897?

CVE-2026-23897 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2026-23897?

Patch guidance is available from apollographql security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-23897.

Fix CVE-2026-23897 - HIGH apollographql apollo server

Q: Which products are affected by CVE-2026-23897?

3 products: apollographql apollo server, apollographql apollo server, apollographql apollo server.

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-1333

Metadata

Primary Vendor: APOLLOGRAPHQL
Published: 2/4/2026
Last Modified: 3/18/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

apollographql : apollo_serverapollographql : apollo_serverapollographql : apollo_server

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-23897. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-23897

View on NIST NVD

CVE-2026-23897 vulnerability