How severe is CVE-2026-42856?

CVE-2026-42856 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2026-42856 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42856?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-42856 have an EU (EUVD) identifier?

Yes. CVE-2026-42856 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29164.

When was CVE-2026-42856 published?

CVE-2026-42856 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-42856

CVE-2026-42856 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29164
Weakness: CWE-306
Published: 2026-05-11
Last modified: 2026-06-17

Description

Network-AI is a TypeScript/Node.js multi-agent orchestrator. Prior to 5.1.3, the MCP HTTP transport accepts JSON-RPC tools/call requests with no authentication, session, origin, or token check, and dispatches them directly to the orchestrator's tool registry. The default bind address is 0.0.0.0. As a result, any party with network reachability to the service can enumerate and invoke privileged management tools. This vulnerability is fixed in 5.1.3.

Frequently asked questions

What is CVE-2026-42856?: Network-AI is a TypeScript/Node.js multi-agent orchestrator. Prior to 5.1.3, the MCP HTTP transport accepts JSON-RPC tools/call requests with no authentication, session, origin, or token check, and dispatches them directly to the orchestrator's tool registry. The default bind address is 0.0.0.0. As a result, any party with network reachability to the service can enumerate and invoke privileged management tools. This vulnerability is fixed in 5.1.3.
How severe is CVE-2026-42856?: CVE-2026-42856 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2026-42856 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-42856?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-42856 have an EU (EUVD) identifier?: Yes. CVE-2026-42856 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29164.
When was CVE-2026-42856 published?: CVE-2026-42856 was published on 2026-05-11 and last updated on 2026-06-17.

References

https://github.com/Jovancoding/Network-AI/security/advisories/GHSA-fj4g-2p96-q6m3

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