CVE-2023-22477

Mercurius is vulnerable to denial of service (DoS) when using subscriptions

HIGH

7.5

CVSS Score

Published: January 9, 2023 at 02:12 PM UTC

Updated: June 17, 2026 at 05:35 AM UTC

2 products affected across 2 vendorsMercuriusProject Mercurius

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Severity

HIGH7.5

Exploit prediction

EPSS 1%

SSVC

PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mercurius · Mercurius Projectnpm

95%

v < 8.13.29.0.0 ≤ v < 11.5.0

Affected range stops below 11.5.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.13.2, so it looks safe — our inference, not a vendor statement

Project Mercurius · Mercurius Js

60%

v < 10.5.0

Affected range stops below 10.5.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCExploitIssue TrackingThird Party Advisory

Source: [email protected]

https://github.com/mercurius-js/mercurius/issues/939

x_refsource_MISCPatchThird Party Advisory

Source: [email protected]

https://github.com/mercurius-js/mercurius/pull/940

x_refsource_CONFIRMPatchThird Party Advisory

Source: [email protected]

https://github.com/mercurius-js/mercurius/security/advisories/GHSA-cm8h-q92v-xcfc

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-248NVD-CWE-Other

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