EUVD-2026-67024
GHSA-rg68-wg77-c3wm
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable server with no authentication or user interaction and low-complexity sandbox escape gives AV:N/AC:L/PR:N/UI:N; arbitrary code as the server process yields full C:H/I:H/A:H, scope unchanged.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Unauthenticated remote code execution affects mims-harvard ToolUniverse through 1.2.6, where the python_code_executor tool runs caller-supplied Python in a sandbox that can be escaped and the HTTP/MCP servers listen on all interfaces with no authentication. Any attacker who can reach the exposed port executes arbitrary code as the server process, since the deny-list source inspection can be bypassed via dunder attribute traversal and a per-call flag that widens the import allow-list. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network reachability to the ToolUniverse HTTP API (http_api_server.py) or SMCP/MCP server (smcp_server.py) with the python_code_executor tool available. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine top-priority issue, not an inflated CVSS number. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scans for ToolUniverse HTTP/MCP ports exposed on 0.0.0.0 and, without any credentials, submits a python_code_executor request whose source uses ().__class__.__base__.__subclasses__() to reach subprocess and run OS commands. Because AV:N/AC:L/PR:N/UI:N applies, a single crafted request to the open port yields code execution as the server process; no public exploit code is identified, but the escape technique is described in the VulnCheck advisory. |
| Remediation | Upgrade to ToolUniverse 1.3.0, which adds bearer-token authentication, defaults the bind address to loopback (127.0.0.1), and hardens the attribute checks in the executor (Vendor-released patch: 1.3.0; see GHSA-pxwq-22vf-87fm and PR 251). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify and inventory all mims-harvard ToolUniverse instances and immediately restrict network access to trusted internal networks or block external access to prevent exploitation. …
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Same weakness CWE-94 – Code Injection
View allSame technique Code Injection
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External POC / Exploit Code
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