OS Command Injection Vulnerability in HKUDS Nanobot by HKUDS
CVE-2026-19243

5.3MEDIUM

Key Information:

Vendor

Hkuds

Status
Nanobot
Vendor
CVE Published:
7 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19243?

A security vulnerability exists in HKUDS Nanobot versions prior to 0.3.0, affecting the Shell Allowlist Handler. Specifically, the issue arises from inadequate validation of shell commands, leading to potential remote command injection. Attackers can exploit this vulnerability by manipulating the ExecTool._guard_command and ExecTool._spawn functions in the shell.py file, which may allow unauthorized command execution on the host system. To mitigate this risk, it is recommended to upgrade to version 0.3.0, which includes a critical patch that effectively validates every executable shell segment against an allowlist, addressing the root cause of this issue.

Affected Version(s)

nanobot 0.2.0

nanobot 0.2.1

nanobot 0.3.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-19243 - Proof of Concept

References

https://vuldb.com/vuln/386997
vdb-entrytechnical-description
https://vuldb.com/vuln/386997/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19243
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Eric-c (VulDB User)
VulDB CNA Team
.