MCP Scores@MCPScores
🚨 Critical vulnerability io.github.XBP-Europe/sagemath-mcp Newly listed carrying an unpatched critical vulnerability (CVE-2026-42557). A fixed version is available.
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CVE-2026-42557(jupyter / jupyterlab)
LOWCVSS 9.6 · CRITICALSignal is active with 1 mentions in latest observed window
Immediate actions
- Track advisory updates for patch or workaround availability
Recommended action window: Monitor and triage in normal cycle
NVD description
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.
0.0/ 10 priority
Sources & remediation
Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-79
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
NONE
Momentum
NONE
Are you affected?
If you run products in this scope, you should treat this CVE as relevant to your environment.
- jupyterlab
- notebook
Threat summary
- 1 mentions across 1 observed day
What's happening
- 1 total mentions across 1 day
Affected systems
Vendors
Products
jupyterlabnotebook
Deep dive
Activity timeline1 mentions / 1d
Full discourse1 post
CPE platform detail2 entries
2 of 2 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | jupyter | jupyterlab | - | - | - |
| App | jupyter | notebook | - | - | - |