CVE-2026-43991 JunoClaw: plugin-shell shell-injection bypass via substring blocklist
Attackers can bypass command safety checks in JunoClaw to execute arbitrary commands on the host system.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-43991?
CVE-2026-43991 is a high-severity command injection vulnerability in Dragonmonk111 junoclaw, published on 12 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
JunoClaw is an agentic AI platform built on Juno Network. Prior to 0.x.y-security-1, substring-based blocklist in plugin-shell's command-safety check could be bypassed by adversarial argument constructions, allowing unauthorized command execution on the host when combined with the companion advisory. Pre-patch, the check was applied to the raw command string rather than the parsed first token. This vulnerability is fixed in 0.x.y-security-1.
Which versions are affected by CVE-2026-43991?
How do I fix CVE-2026-43991?
No fix has been published for CVE-2026-43991 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-43991 being exploited?
There is no known exploitation of CVE-2026-43991 in the wild and no public exploit code.
Sources
Also known as GHSA-fvq5-79h6-952c.