CVE-2026-43989: JunoClaw upload_wasm MCP tool accepts unvalidated filesystem paths

Summary

CVE-2026-43989 affects JunoClaw, an agentic AI platform built on Juno Network, prior to 0.x.y-security-1. The upload_wasm MCP tool accepted a filesystem path from the agent and uploaded whatever bytes that path resolved to, without validating location, symlink target, file size, or file format. The flaw is classified as CWE-20, CWE-22, CWE-59 and CWE-73.

Mitigation

Fixed in 0.x.y-security-1.

Topics

• AI agents
• Model Context Protocol

Related items

• MediumCVE-2026-102610: fast-agent serve unauthenticated remote command execution via /mcp endpointSimilar attack · NVD/CVE Database
• CriticalCVE-2026-58490: Tracecat SAML authentication bypass through unsigned responses in Docker ComposeSimilar attack · NVD/CVE Database
• MediumCVE-2026-124028: mistral.rs delimiter injection allows attacker-chosen tool calls via quoted textSimilar attack · NVD/CVE Database
• HighCVE-2026-123974: TorchServe local privilege escalation via predictable /tmp extraction directorySimilar attack · NVD/CVE Database
• InfoOpenAI Says New GPT-6 Cyber Model Hunts Flaws Without Crossing the LineSimilar attack · SecurityWeek