Vulnerability-Lookup

CVE-2026-23897 (GCVE-0-2026-23897)

Vulnerability from cvelistv5 – Published: 2026-02-04 19:18 – Updated: 2026-02-04 19:55

Title

Apollo Server is vulnerable to denial of service with `startStandaloneServer`

Summary

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.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-1333 - Inefficient Regular Expression Complexity

Assigner

GitHub_M

References

URL

Tags

	https://github.com/apollographql/apollo-server/se…	x_refsource_CONFIRM
	https://github.com/apollographql/apollo-server/co…	x_refsource_MISC
	https://github.com/apollographql/apollo-server/co…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	apollographql	apollo-server	Affected: >= 2.0.0, <= 3.13.0 Affected: >= 4.2.0, < 4.13.0 Affected: >= 5.0.0, < 5.4.0

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-23897

Vulnerability from fkie_nvd - Published: 2026-02-04 20:16 - Updated: 2026-03-18 13:06

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/apollographql/apollo-server/commit/d25a5bdc377826ad424fcf7f8d1d062055911643	Patch
security-advisories@github.com	https://github.com/apollographql/apollo-server/commit/e9d49d163a86b8a33be56ed27c494b9acd5400a4	Patch
security-advisories@github.com	https://github.com/apollographql/apollo-server/security/advisories/GHSA-mp6q-xf9x-fwf7	Mitigation, Vendor Advisory

Impacted products

Vendor	Product	Version
apollographql	apollo_server	*
apollographql	apollo_server	*
apollographql	apollo_server	*

JSON

To clipboard

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GHSA-MP6Q-XF9X-FWF7

Vulnerability from github – Published: 2026-02-04 18:02 – Updated: 2026-02-04 21:55

Summary

Apollo Serve vulnerable to Denial of Service with `startStandaloneServer`

Details

Impact

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.

Who is impacted

Users directly using startStandaloneServer from @apollo/server/standalone.

This issue affects Apollo Server from v5.0.0 through v5.3.x.

It also affects all releases of the end-of-life major versions v4, v3, and v2. Although Apollo Server v4 is EOL and Apollo no longer commits to providing support or updates for it, a fix for it was released in v4.13.0. Apollo Server v3 and v2 are no longer updated, as they have been EOL since 2024 and 2023 respectively.

Patches

Patches for this issue are released as @apollo/server versions 5.4.0 and 4.13.0.

In accordance with RFC 7159, these versions now only accept request bodies encoded in UTF-8, UTF-16 (LE or BE), or UTF-32 (LE or BE). Any other character set will be rejected with a 415 Unsupported Media Type error. Note that the more recent JSON RFC, [RFC 8259 (https://datatracker.ietf.org/doc/html/rfc8259#section-8.1), is more strict and will only allow UTF-8. Since this is a minor release, we have chosen to remain compatible with the more permissive RFC 7159 for now. In a future major release, the restriction may be tightened further to only allow UTF-8.

Workarounds

Users of apollo-server v2 or v3 that cannot upgrade for some reason could switch from the standalone apollo-server package to an integration package like apollo-server-express or apollo-server-koa and set up their own server. Please note that these old packages are generally EOL and do not receive any more support or bug fixes. This can only be seen as a short-term workaround. Updating to @apollo/server v5 should be a priority.

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

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    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-04T18:02:26Z",
    "nvd_published_at": "2026-02-04T20:16:05Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe 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.\n\nThis 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`.\n\n### Who is impacted\n\nUsers directly using `startStandaloneServer` from `@apollo/server/standalone`.\n\nThis issue affects Apollo Server from v5.0.0 through v5.3.x.\n\nIt also affects all releases of the end-of-life major versions v4, v3, and v2.  Although Apollo Server v4 is EOL and Apollo no longer commits to providing support or updates for it, a fix for it was released in v4.13.0.  Apollo Server v3 and v2 are no longer updated, as they have been EOL since 2024 and 2023 respectively.\n\n### Patches\n\nPatches for this issue are released as `@apollo/server` versions `5.4.0` and `4.13.0`.\n\nIn accordance with [RFC 7159](https://datatracker.ietf.org/doc/html/rfc7159#section-8.1), these versions now only accept request bodies encoded in UTF-8, UTF-16 (LE or BE), or UTF-32 (LE or BE). Any other character set will be rejected with a `415 Unsupported Media Type` error. Note that the more recent JSON RFC, [RFC 8259 (https://datatracker.ietf.org/doc/html/rfc8259#section-8.1), is more strict and will only allow UTF-8. Since this is a minor release, we have chosen to remain compatible with the more permissive RFC 7159 for now. In a future major release, the restriction may be tightened further to only allow UTF-8.\n\n### Workarounds\n\nUsers of `apollo-server` v2 or v3 that cannot upgrade for some reason could switch from the standalone `apollo-server`\npackage to an integration package like `apollo-server-express` or `apollo-server-koa` and set up their own server. Please note that these old packages are generally EOL and do not receive any more support or bug fixes. This can only be seen as a short-term workaround. Updating to `@apollo/server` v5 should be a priority.",
  "id": "GHSA-mp6q-xf9x-fwf7",
  "modified": "2026-02-04T21:55:11Z",
  "published": "2026-02-04T18:02:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/apollographql/apollo-server/security/advisories/GHSA-mp6q-xf9x-fwf7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23897"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apollographql/apollo-server/commit/d25a5bdc377826ad424fcf7f8d1d062055911643"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apollographql/apollo-server/commit/e9d49d163a86b8a33be56ed27c494b9acd5400a4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apollographql/apollo-server"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apollo Serve vulnerable to Denial of Service with `startStandaloneServer`"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-23897 (GCVE-0-2026-23897)

FKIE_CVE-2026-23897

GHSA-MP6Q-XF9X-FWF7

Impact

Who is impacted

Patches

Workarounds

Tags

Sightings

Nomenclature