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CVE-2026-30241

Mercurius is a GraphQL adapter for Fastify. Prior to version 16.8.0, Mercurius fails to enforce the configured queryDepth limit on GraphQL subscription queries received over WebSocket connections. The depth check is correctly applied to HTTP queries and mutations, but subscription queries are parsed and executed without invoking the depth validation. This allows a remote client to submit arbitrarily deeply nested subscription queries over WebSocket, bypassing the intended depth restriction. On s
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eab58c42fe97e308436361d1922d614c5161d07b689413523ee0563c5c40992d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"mercurius","vendor":"mercurius-js","versions":[{"status":"affected","version":"< 16.8.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:47854627f9d385ae3fd4d3e90925c77a3562b92cf6dcecb2ae41e3638ea18088 · sha256:5d3c02bb2301ed92… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":2.7,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:47854627f9d385ae3fd4d3e90925c77a3562b92cf6dcecb2ae41e3638ea18088 · sha256:5d3c02bb2301ed92… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-863","description":"CWE-863: Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:47854627f9d385ae3fd4d3e90925c77a3562b92cf6dcecb2ae41e3638ea18088 · sha256:5d3c02bb2301ed92… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/mercurius-js/mercurius/commit/5b56f60f4b0d60780b0ff499a479bd830bdd6986","tags":["x_refsource_MISC"],"url":"https://github.com/mercurius-js/mercurius/commit/5b56f60f4b0d60780b0ff499a479bd830bdd6986"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47854627f9d385ae3fd4d3e90925c77a3562b92cf6dcecb2ae41e3638ea18088 · sha256:5d3c02bb2301ed92… · /containers/cna/references/1
{"name":"https://github.com/mercurius-js/mercurius/security/advisories/GHSA-m4h2-mjfm-mp55","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mercurius-js/mercurius/security/advisories/GHSA-m4h2-mjfm-mp55"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:47854627f9d385ae3fd4d3e90925c77a3562b92cf6dcecb2ae41e3638ea18088 · sha256:5d3c02bb2301ed92… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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