CriticalVulnerabilityLLM-specific

CVE-2026-43992: JunoClaw MCP write tools expose BIP-39 mnemonic in LLM tool-call parameters

Source: NVD(opens in a new tab)
Identifier: CVE-2026-43992
Published: May 12, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.4%

Summary

CVE-2026-43992 affects JunoClaw, an agentic AI platform built on Juno Network, prior to 0.x.y-security-1. Every MCP write tool, including send_tokens, execute_contract, instantiate_contract, upload_wasm and ibc_transfer, accepted 'mnemonic: string' as an explicit tool-call parameter. As a result, the BIP-39 seed was embedded in the LLM tool-call JSON and exposed to any transport, log or telemetry surface between the LLM provider and the MCP process.

Mitigation

This vulnerability is fixed in 0.x.y-security-1.

Details

Scores and exploitation

CVSS score: 9.8(critical)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: none
EPSS: 0.4%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on October 13, 2026.
Disclosure date: May 12, 2026

Weaknesses and techniques

Weakness (CWE): CWE-200
CWE-312
CWE-522
CWE-532
Attack pattern (CAPEC): CAPEC-116
CAPEC-215

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Plugin
Impact: Confidentiality
Labels: security,
privacy

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-43992

First tracked: May 12, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 93% (self-assessed)

Summary

Mitigation

Topics

Related items