Vulnerability · Published Sep 14, 2026 · Assigned by VulDB

CVE-2026-90808HKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklist

Medium 6.3

In plain English

A medium-severity security flaw in nanobot from HKUDS. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 35% of all known vulnerabilities).

Severity (CVSS 3.1)6.3Medium

Exploit odds (30 days)0.4%top 64.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was determined in HKUDS nanobot up to 0.2.1. Impacted is the function ExecTool._guard_command/ExecTool._spawn of the file nanobot/agent/tools/shell.py of the component ExecTool. This manipulation causes incomplete blacklist. It is possible to initiate the attack remotely. Patch name: af582246f141311d574551b7571a517bcc3df750. Applying a patch is the recommended action to fix this issue.

Affected products (as reported)

Vendor	Product	Versions
HKUDS	nanobot	0.2.00.2.1

Weakness: CWE-184, CWE-183 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

References

VDB-403310 | HKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklist vdb-entry, technical-description
VDB-403310 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
CVE-2026-90808 | CVE Analysis and Report third-party-advisory
Submit #922849 | HKUDS nanobot <= 0.2.1 Incomplete List of Disallowed Inputs (CWE-184) third-party-advisory
https://github.com/HKUDS/nanobot/issues/5305 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