CVE-2026-81096

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Source
https://cve.org/CVERecord?id=CVE-2026-81096
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81096.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-81096
Aliases
  • GHSA-pxwq-22vf-87fm
Published
2026-08-27T14:50:36.897Z
Modified
2026-08-30T03:48:24.157767382Z
Severity
  • 9.3 (Critical) CVSS_V4 - 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 CVSS Calculator
Summary
ToolUniverse through 1.2.6 Unauthenticated Remote Code Execution via python_code_executor Sandbox Escape
Details

ToolUniverse ran caller-supplied Python inside a sandbox that could be escaped, on a server that required no authentication. The executor behind the pythoncodeexecutor tool, in pythonexecutortool.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 httpapiserver.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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81096.json",
    "cwe_ids": [
        "CWE-94"
    ],
    "cna_assigner": "VulnCheck"
}
References

Affected packages

Git / github.com/mims-harvard/tooluniverse

Affected ranges

Type
GIT
Repo
https://github.com/mims-harvard/tooluniverse
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
ba98160c8813a9f345309c364684ce24649cb341
Database specific
Show details 
{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.2.6"
        }
    ]
}

Affected versions

Other
mcpb
v1.*
v1.0.10
v1.0.11
v1.0.11.1
v1.0.11.2
v1.0.12
v1.0.12.1
v1.0.12.2
v1.0.12.3
v1.0.12.4
v1.0.12.5
v1.0.12.6
v1.0.12.7
v1.0.13.1
v1.0.13.2
v1.0.14
v1.0.14.1
v1.0.14.2
v1.0.15.1
v1.0.15.2
v1.0.15.3
v1.0.15.4
v1.0.15.5
v1.0.15.6
v1.0.15.7
v1.0.16
v1.0.17
v1.0.17.1
v1.0.17.2
v1.0.17.3
v1.0.17.4
v1.0.17.5
v1.0.17.6
v1.0.17.7
v1.0.17.8
v1.0.17.9
v1.0.18
v1.0.19
v1.0.19.1
v1.0.21
v1.0.22
v1.0.8
v1.0.9
v1.0.9.1
v1.1.1
v1.1.10
v1.1.11
v1.1.2
v1.1.3
v1.1.4
v1.1.7
v1.1.8
v1.1.9
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.2.5
v1.2.6

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81096.json"