CVE-2026-90809 HKUDS nanobot ExecTool shell.py ExecTool._spawn argument injection
Remote attackers can inject arguments into the nanobot ExecTool shell execution, potentially leading to arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90809?
CVE-2026-90809 is a medium-severity command injection vulnerability in HKUDS nanobot, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability was identified in HKUDS nanobot up to 0.2.1. The affected element is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component ExecTool. Such manipulation leads to argument injection. It is possible to launch the attack remotely. The name of the patch is af582246f141311d574551b7571a517bcc3df750. It is best practice to apply a patch to resolve this issue.
Which versions are affected by CVE-2026-90809?
How do I fix CVE-2026-90809?
No fix has been published for CVE-2026-90809 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-2026-90809 being exploited?
There is no known exploitation of CVE-2026-90809 in the wild and no public exploit code.
Sources
Also known as GHSA-7hvv-vr32-8c2m.