CVE-2026-90808HKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklist

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.

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-403310 | HKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklist vdb-entrytechnical-description
• VDB-403310 | CTI Indicators (IOB, IOC, TTP, IOA) signaturepermissions-required
• CVE-2026-90808 | CVE Analysis and Report third-party-advisory
• Submit #922849 | HKUDS nanobot <= 0.2.1 Incomplete List of Disallowed Inputs (CWE-184) third-party-advisory
• https://github.com/HKUDS/nanobot/issues/5305 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