CVE-2026-19243 in nanobot
Summary
by MITRE • 08/07/2026
A security vulnerability has been detected 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 Shell Allowlist Handler. Such manipulation leads to os command injection. The attack can be executed remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 0.3.0 is recommended to address this issue. The name of the patch is 4562. It is advisable to upgrade the affected component. Multiple issues were reported to the project. They reacted with a high level of professionalism and kindness: "These five reports are variants of the same root cause: validation of shell commands containing multiple segments, wrappers, comments, or chained commands. The issue was fixed by validating every executable shell segment against the configured allowlist".
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Analysis
by VulDB Data Team • 08/08/2026
This vulnerability resides within the HKUDS nanobot software version 0.2.1 and earlier, specifically targeting the Shell Allowlist Handler component. The flaw exists in the ExecTool._guard_command and ExecTool._spawn functions located in the nanobot/agent/tools/shell.py file, representing a critical security weakness that enables unauthorized command execution. The vulnerability stems from insufficient validation of shell commands that contain multiple segments, wrappers, comments, or chained commands, creating opportunities for attackers to inject malicious operating system commands through the application's interface.
The technical implementation of this flaw allows for remote exploitation where attackers can manipulate the shell command validation mechanism to bypass security restrictions. This occurs because the system fails to properly validate each executable segment of a shell command against the configured allowlist, enabling attackers to construct command sequences that appear legitimate but contain malicious payloads. The vulnerability operates at the intersection of CWE-78 and CWE-88, where improper neutralization of special elements in command execution contexts leads directly to command injection attacks. According to ATT&CK framework, this maps to T1059.001 - Command and Scripting Interpreter: Shell Script, specifically targeting the execution of arbitrary commands through shell interfaces.
The operational impact of this vulnerability extends beyond simple privilege escalation as it allows attackers to execute arbitrary operating system commands with the privileges of the nanobot service account. This could enable full system compromise, data exfiltration, or lateral movement within network environments where the nanobot is deployed. The public disclosure of exploitation techniques increases the risk profile significantly, as threat actors can readily implement known attack patterns against vulnerable installations. Organizations running affected versions face potential unauthorized access to sensitive systems and data processing capabilities.
The recommended mitigation strategy involves upgrading to version 0.3.0, which addresses the vulnerability through enhanced validation mechanisms that properly check every executable shell segment against configured allowlists. The patch implementation demonstrates a professional approach to vulnerability remediation by recognizing that all reported issues stemmed from the same root cause rather than treating them as isolated incidents. This systematic fix ensures comprehensive protection against similar command injection vectors and aligns with industry best practices for input validation and privilege separation in automated systems. The developers' response reflects strong security maturity in addressing complex attack surface issues through architectural improvements rather than superficial fixes, thereby strengthening overall system resilience against command injection threats.