CVE-2026-42856Public exploitNetwork attack vector

Unauthenticated tool invocation via unchecked JSON-RPC dispatch

Published May 11, 2026 · Updated May 11, 2026

Missing authentication in Network-AI before 5.1.3 allows remote attackers to invoke privileged management tools over MCP HTTP. The _handlePost() handler parses an untrusted JSON-RPC body and sends it to handleRPC(), which dispatches tools/call directly to the tool registry without checking a session, origin, or token. Network reachability is sufficient because the server binds to 0.0.0.0 by default, exposing reads and writes to live configuration, agent control, shared state, security tokens, and budget ceilings.

CVSS severity8.7
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Network-AI before 5.1.3 allows remote attackers to invoke privileged management tools over MCP HTTP. The _handlePost() handler parses an untrusted JSON-RPC body and sends it to handleRPC(), which dispatches tools/call directly to the tool registry without checking a session, origin, or token. Network reachability is sufficient because the server binds to 0.0.0.0 by default, exposing reads and writes to live configuration, agent control, shared state, security tokens, and budget ceilings.

The record

CVE
CVE-2026-42856
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Jovancoding
Product
Network-AI
Classifications
CWE-306, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 5.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Jovancoding · Network-AIversion=< 5.1.3

Published CVSS scores

8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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