CVE-2026-90809HKUDS nanobot ExecTool shell.py ExecTool._spawn argument injection

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• VDB-403311 | HKUDS nanobot ExecTool shell.py ExecTool._spawn argument injection vdb-entrytechnical-description
• VDB-403311 | CTI Indicators (IOB, IOC, TTP, IOA) signaturepermissions-required
• CVE-2026-90809 | CVE Analysis and Report third-party-advisory
• Submit #922850 | HKUDS nanobot <= 0.2.1 Improper Neutralization of Argument Delimiters in a Command (CWE-88) third-party-advisory
• https://github.com/HKUDS/nanobot/issues/5306 issue-tracking
• https://github.com/HKUDS/nanobot/pull/5345 issue-trackingpatch
• https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750 patch
• https://github.com/HKUDS/nanobot/ product