CVE-2026-90809 Details
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.
A vulnerability allowing argument injection has been identified in HKUDS Nanobot versions through 0.2.1. The issue resides in the ExecTool component, specifically within the ExecTool._guard_command and ExecTool._spawn functions in nanobot/agent/tools/shell.py. This vulnerability can be exploited remotely, leading to unintended command execution with the same OS-level privileges as the running Nanobot process.
Users are advised to update to version 0.3.5, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 14, 2026CISA-ADP
Assessed Sep 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/HKUDS/nanobot/ | [email protected] | ProductVendor |
| https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750 | [email protected] | Source CodeVendor |
| https://github.com/HKUDS/nanobot/issues/5306 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/HKUDS/nanobot/pull/5345 | [email protected] | Issue TrackingVendor |
| https://vuldb.com/cve/CVE-2026-90809 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/922850 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/403311 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/403311/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-74 | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') | [email protected] |
| CWE-88 | Improper Neutralization of Argument Delimiters in a Command ('Argument Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| HKUDS nanobot | <= 0.2.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | CVE Modified | CISA-ADP |
| Sep 14, 2026 | New CVE Received | [email protected] |