CVE-2026-43992
JunoClaw: MCP write tools exposed raw BIP-39 mnemonic as a tool-call parameter
Description
JunoClaw is an agentic AI platform built on Juno Network. Prior to 0.x.y-security-1, every MCP write tool (send_tokens, execute_contract, instantiate_contract, upload_wasm, ibc_transfer, etc.) accepted 'mnemonic: string' as an explicit tool-call parameter. The BIP-39 seed was consequently embedded in the LLM tool-call JSON, exposing it to any transport, log, or telemetry surface in the path between the LLM provider and the MCP process. This vulnerability is fixed in 0.x.y-security-1.
INFO
Published Date :
May 12, 2026, 5:16 p.m.
Last Modified :
Oct. 26, 2026, 6:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | CRITICAL | [email protected] |
Solution
- Update JunoClaw to version 0.x.y-security-1.
- Verify tool-call parameter security.
- Remove explicit mnemonic parameter.
Public PoC/Exploit Available at Github
CVE-2026-43992 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43992.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43992 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43992
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
The Project shares all information on MCP related CVE's published
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The following list is the news that have been mention
CVE-2026-43992 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43992 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: junoclaw de Dragonmonk111, Description: JunoClaw es una plataforma de IA agéntica construida sobre Juno Network. Antes de 0.x.y-security-1, cada herramienta de escritura de MCP (send_tokens, execute_contract, instantiate_contract, upload_wasm, ibc_transfer, etc.) aceptaba ’mnemonic: string’ como un parámetro explícito de llamada a herramienta. La semilla BIP-39 fue consecuentemente incrustada en el JSON de llamada a herramienta del LLM, exponiéndola a cualquier superficie de transporte, registro o telemetría en la ruta entre el proveedor del LLM y el proceso de MCP. Esta vulnerabilidad está corregida en 0.x.y-security-1. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Dragonmonk111', 'product': 'junoclaw', 'versions': [{'status': 'affected', 'version': '< v0.x.y-security-1'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-43992', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-05-13T14:34:03.835477Z'} -
New CVE Received by [email protected]
May. 12, 2026
Action Type Old Value New Value Added Description JunoClaw is an agentic AI platform built on Juno Network. Prior to 0.x.y-security-1, every MCP write tool (send_tokens, execute_contract, instantiate_contract, upload_wasm, ibc_transfer, etc.) accepted 'mnemonic: string' as an explicit tool-call parameter. The BIP-39 seed was consequently embedded in the LLM tool-call JSON, exposing it to any transport, log, or telemetry surface in the path between the LLM provider and the MCP process. This vulnerability is fixed in 0.x.y-security-1. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-200 Added CWE CWE-532 Added CWE CWE-312 Added CWE CWE-522 Added Reference https://github.com/Dragonmonk111/junoclaw/commit/339701e Added Reference https://github.com/Dragonmonk111/junoclaw/releases/tag/v0.x.y-security-1 Added Reference https://github.com/Dragonmonk111/junoclaw/security/advisories/GHSA-j75q-8xvm-6c48