EUVD-2026-27211Severity by source
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:P/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
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
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:P/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
A flaw has been found in UsamaK98 python-notebook-mcp up to a05a232815809a7e425b5fa7be26e0d4369894c2. Impacted is the function create_notebook/read_notebook/edit_cell/add_cell of the file server.py. This manipulation causes path traversal. It is possible to initiate the attack remotely. The exploit has been published and may be used. This product is using a rolling release to provide continious delivery. Therefore, no version details for affected nor updated releases are available. The project was informed of the problem early through an issue report but has not responded yet.
AnalysisAI
Path traversal in UsamaK98 python-notebook-mcp allows remote unauthenticated attackers to read, write, and manipulate notebook files outside their intended directory via crafted input to the create_notebook, read_notebook, edit_cell, and add_cell functions in server.py. Public exploit code is available. The project uses rolling releases with no versioning, and the vendor has not yet responded to the initial issue report despite early notification.
Technical ContextAI
python-notebook-mcp is a Python-based notebook server implementation that exposes file operations through API endpoints. The vulnerability exists in CWE-22 (Path Traversal), where user-supplied input to notebook creation, reading, and cell manipulation functions is not properly validated or sanitized before being used in file path construction. This allows attackers to use path traversal sequences (such as '../../../') to access files outside the intended notebook storage directory. The affected functions operate on the server.py file, which likely handles HTTP request routing and file I/O operations without adequate path canonicalization or allowlist validation.
RemediationAI
No vendor-released patch is currently available. The project has not responded to the early issue report. For immediate mitigation, restrict network access to the python-notebook-mcp server to trusted sources only using a firewall or reverse proxy that validates and sanitizes file path parameters before forwarding requests. Disable or remove the create_notebook, read_notebook, edit_cell, and add_cell endpoints if not in active use. Implement strict input validation on the server side to reject any path components containing '..', '/', or other directory traversal sequences before processing file operations. Run the service in a chroot jail or container with a read-only root filesystem and mounted volumes restricted to the intended notebook directory to contain the blast radius. Monitor for exploitation attempts by logging and alerting on HTTP requests containing suspicious path sequences. Track the GitHub repository (https://github.com/UsamaK98/python-notebook-mcp/) for vendor patches and consider contributing a fix upstream if internal resources permit.
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
Leaving vuln.today