CVE-2026-90808 HKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklist
Incomplete command blacklist in nanobot ExecTool allows remote attackers to execute arbitrary shell commands.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90808?
CVE-2026-90808 is a medium-severity command injection vulnerability in HKUDS nanobot, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was determined in HKUDS nanobot up to 0.2.1. Impacted is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component ExecTool. This manipulation causes incomplete blacklist. It is possible to initiate the attack remotely. Patch name: af582246f141311d574551b7571a517bcc3df750. Applying a patch is the recommended action to fix this issue.
Which versions are affected by CVE-2026-90808?
How do I fix CVE-2026-90808?
No fix has been published for CVE-2026-90808 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-2026-90808 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90808 exists.
Sources
Also known as GHSA-vwc9-2889-5p3f.