CVE-2026-90809: medium-severity vulnerability in HKUDS nanobot
HKUDS nanobot ExecTool shell.py ExecTool._spawn argument injection
Published · Updated
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.6%
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.
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
Affected products
HKUDS · nanobotRelated CVEs — HKUDS nanobot
In the same product, most dangerous first.
CVE-2026-19243MEDIUMHKUDS nanobot Shell Allowlist shell.py ExecTool._spawn os command injectionEPSS 2.3%CVE-2026-2577CRITICALNanobot Unauthenticated WhatsApp Session Hijack via WebSocket BridgeEPSS 0.7%CVE-2026-33654HIGHZero-Click Indirect Prompt Injection and Authentication Bypass via Email PollingEPSS 0.5%CVE-2026-19244MEDIUMHKUDS nanobot MCP enabledTools Scope mcp.py connect_mcp_servers access controlEPSS 0.5%CVE-2026-92576CRITICALHKUDS nanobot before 0.3.0 Server-Side Request Forgery via WebFetchToolEPSS 0.4%CVE-2026-90808MEDIUMHKUDS nanobot ExecTool shell.py ExecTool._spawn incomplete blacklistEPSS 0.4%
References
https://github.com/HKUDS/nanobot/https://github.com/HKUDS/nanobot/commit/af582246f141311d574551b7571a517bcc3df750https://github.com/HKUDS/nanobot/issues/5306https://github.com/HKUDS/nanobot/pull/5345https://vuldb.com/cve/CVE-2026-90809https://vuldb.com/submit/922850https://vuldb.com/vuln/403311https://vuldb.com/vuln/403311/cti