High severity · published Sep 14, 2026
CVE-2026-90809
HKUDS nanobot ExecTool shell.py ExecTool._spawn argument injection
7.3
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NA
nanobot · HKUDS
0.2.0; 0.2.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90809
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90809
github.com
https://github.com/HKUDS/nanobot/
github.com
https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750
github.com
https://github.com/HKUDS/nanobot/issues/5306
github.com
https://github.com/HKUDS/nanobot/pull/5345
vuldb.com
https://vuldb.com/cve/CVE-2026-90809
vuldb.com
https://vuldb.com/submit/922850
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