---
title: "CVE-2026-90809: HKUDS nanobot - Command Injection"
description: "HKUDS nanobot <= 0.2.1 contains a command injection caused by improper handling in ExecTool._guard_command and ExecTool._spawn in nanobot/agent/tools/shell.py, letting remote attackers inject arguments, exploit requires remote access."
url: https://panop.io/threat-heartbeat/CVE-2026-90809/
---

# CVE-2026-90809 HKUDS nanobot - Command Injection

HKUDS nanobot <= 0.2.1 contains a command injection caused by improper handling in ExecTool.\_guard\_command and ExecTool.\_spawn in nanobot/agent/tools/shell.py, letting remote attackers inject arguments, exploit requires remote access.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.56% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90809)

## Details

Type

Command Injection

Impact

Command Injection, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Published

14 September 2026

Updated

15 October 2026

Weakness

[CWE-74](https://cwe.mitre.org/data/definitions/74.html)

## Vendor fix

Apply the patch af582246f141311d574551b7571a517bcc3df750 or update to a version later than 0.2.1.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90809](https://nvd.nist.gov/vuln/detail/CVE-2026-90809)
- [https://github.com/HKUDS/nanobot/issues/5306](https://github.com/HKUDS/nanobot/issues/5306)
- [https://github.com/HKUDS/nanobot/pull/5345](https://github.com/HKUDS/nanobot/pull/5345)
- [https://vuldb.com/cve/CVE-2026-90809](https://vuldb.com/cve/CVE-2026-90809)
- [https://vuldb.com/submit/922850](https://vuldb.com/submit/922850)
- [https://vuldb.com/vuln/403311](https://vuldb.com/vuln/403311)
- [https://vuldb.com/vuln/403311/cti](https://vuldb.com/vuln/403311/cti)
- [https://github.com/HKUDS/nanobot/](https://github.com/HKUDS/nanobot/)
- [https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750](https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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