# CVE-2026-90809

## Summary

- **CVE ID:** CVE-2026-90809
- **Severity:** MEDIUM
- **CVSS Score:** 7.5 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X)
- **CWE:** CWE-88, CWE-74
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- HKUDS — nanobot (0.2.0)
- HKUDS — nanobot (0.2.1)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._