CVE-2023-22477

Name: CVE-2023-22477
Creator: NVD / NIST
Published: 2023-01-09T15:15:11.127+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.06%

Last modified Jun 17, 2026

CVE-2023-22477 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Mercurius is a GraphQL adapter for Fastify. Any users of Mercurius until version 10.5.0 are subjected to a denial of service attack by sending a malformed packet over WebSocket to `/graphql`. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

Description

Mercurius is a GraphQL adapter for Fastify. Any users of Mercurius until version 10.5.0 are subjected to a denial of service attack by sending a malformed packet over WebSocket to `/graphql`. This issue was patched in #940. As a workaround, users can disable subscriptions.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.06%

60.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-248

Affected Software

Vendor	Product	Versions
Mercurius Project	Mercurius	< 8.13.2
Mercurius Project	Mercurius	>= 9.0.0, < 11.5.0

References

https://github.com/mercurius-js/mercurius/issues/939Exploit, Issue Tracking, Third Party Advisory
https://github.com/mercurius-js/mercurius/pull/940Patch, Third Party Advisory
https://github.com/mercurius-js/mercurius/security/advisories/GHSA-cm8h-q92v-xcfcPatch, Third Party Advisory
https://github.com/mercurius-js/mercurius/issues/939Exploit, Issue Tracking, Third Party Advisory
https://github.com/mercurius-js/mercurius/pull/940Patch, Third Party Advisory
https://github.com/mercurius-js/mercurius/security/advisories/GHSA-cm8h-q92v-xcfcPatch, Third Party Advisory

Timeline

Published: Jan 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-22477?

How severe is CVE-2023-22477?

CVE-2023-22477 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2023-22477?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-22477?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST