Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
ToolUniverse ran caller-supplied Python inside a sandbox that could be escaped, on a server that required no authentication. The executor behind the python_code_executor tool, in python_executor_tool.py, inspected the submitted source for a denied list of attribute names and calls but left the attribute-lookup builtins available and did not stop a dunder attribute reached through a string lookup or through a module already permitted, so a caller could walk from a literal's class to its base and enumerate subclasses to obtain a reference to the process and subprocess modules. A per-call argument also let the caller widen the import allow-list before the inspection ran. The HTTP and MCP servers in http_api_server.py and smcp_server.py bound to every interface with debugging enabled and no authentication, so any caller able to reach the port executed code as the server process. Version 1.3.0 adds bearer-token authentication, defaults the bind address to loopback, and hardens the attribute checks.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-09-03 | 1 | Patch1 |
| 2026-09-04 | 1 | General1 |
| 2026-09-12 | 1 | Patch1 |
4/ CVE-2026-81096, published 27 Aug. ToolUniverse: caller-supplied Python in an escapable sandbox, server bound to every interface, no auth. NVD 9.3, critical. Version 1.3.0 fixed it. 1.3.0 existed the whole time my issue sat open.
Post summary
The post details CVE‑2026‑81096 as a critical vulnerability involving an unprotected Python sandbox and notes that version 1.3.0 contains a fix.
🧨 AI and MCP Tooling: The Attack Surface Nobody Audited Two vulnerabilities this week put a spotlight on the security maturity gap in AI infrastructure tooling. CVE-2026-81096 (CVSS 10.0) affects ToolUniverse, which ran caller-supplied…
Post summary
The post highlights CVE-2026-81096 with a CVSS 10.0 score affecting ToolUniverse, but lacks PoC, exploitation details, patch information, or evidence of active use.
🐍 ToolUniverse =<1.2.6: unauthenticated RCE via python_code_executor sandbox escape. No auth needed, full system access. CVE-2026-81096 scores 9.3 critical. Patch or restrict access now. #cybersecurity #ciso #vulnerabilities #mssp https://secalerts.co/vulnerability/CVE-2026-81096?utm_campaign=x https://t.co/GORmXAxLGh
Post summary
A critical unauthenticated remote code execution vulnerability (CVE‑2026‑81096) has been disclosed, and immediate patching or access restriction is advised.