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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-30241

26
FAUCET Score

CVE-2026-30241 affects Mercurius, a GraphQL adapter for Fastify, prior to version 16.8.0. The vulnerability allows remote clients to bypass queryDepth limits on GraphQL subscription queries over WebSocket connections, potentially leading to denial of service on schemas with recursive types. The CVSS 4.0 score is 2.7 (LOW), indicating a network-based attack with low impact on availability and integrity, but no impact on confidentiality. There is no evidence of active exploitation, public exploit code, or Metasploit/Nuclei modules. Community discussion is minimal, with only one mention observed.

Impacted Technologies

VendorProductVersion(s)CPE
< 16.8.0CPE matchmatch criteria
cpe:2.3:a:mercurius_project:mercurius:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 4.0

2.7LOW

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
LOW
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
UNREPORTED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.36%
Probability of exploitation in next 30 days
EPSS Percentile
28.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0036 is in the 9th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: mercuriusFixed in: 16.8.0

Vendor Advisories (1)

npmGHSA-m4h2-mjfm-mp55low

Mercurius's queryDepth limit bypassed for WebSocket subscriptions

Mar 6, 2026

References

github.com / mercurius-js/mercurius/commit/5b56f60f4b0d60780b0ff499a479bd830bdd6986
Patch
github.com / mercurius-js/mercurius/security/advisories/GHSA-m4h2-mjfm-mp55
Vendor Advisory