CVE-2026-43989 JunoClaw: upload_wasm accepted arbitrary filesystem paths without validation
An attacker can read arbitrary files from the server filesystem by providing malicious paths to the upload_wasm tool in JunoClaw.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-43989?
CVE-2026-43989 is a high-severity path traversal vulnerability in Dragonmonk111 junoclaw, published on 12 May 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
JunoClaw is 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 the path resolved to, with no validation of location, symlink target, file size, or file format. This vulnerability is fixed in 0.x.y-security-1.
Which versions are affected by CVE-2026-43989?
How do I fix CVE-2026-43989?
No fix has been published for CVE-2026-43989 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-43989 being exploited?
There is no known exploitation of CVE-2026-43989 in the wild and no public exploit code.
Sources
Also known as GHSA-rw59-34hw-pmwp.