Vulnerability · Published Sep 14, 2026 · Assigned by VulDB

CVE-2026-90809HKUDS nanobot ExecTool shell.py ExecTool._spawn argument injection

High 7.3

In plain English

A high-severity argument injection in nanobot from HKUDS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).

Severity (CVSS 3.1)7.3High

Exploit odds (30 days)0.6%top 53.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
HKUDS	nanobot	0.2.00.2.1

Weakness: CWE-88, CWE-74 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

References

VDB-403311 | HKUDS nanobot ExecTool shell.py ExecTool._spawn argument injection vdb-entry, technical-description
VDB-403311 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-90809 | CVE Analysis and Report third-party-advisory
Submit #922850 | HKUDS nanobot <= 0.2.1 Improper Neutralization of Argument Delimiters in a Command (CWE-88) third-party-advisory
https://github.com/HKUDS/nanobot/issues/5306 issue-tracking
https://github.com/HKUDS/nanobot/pull/5345 issue-tracking, patch
https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750 patch
https://github.com/HKUDS/nanobot/ product