Is CVE-2026-111058 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-111058?

CVE-2026-111058 has a CVSS v3 severity of CRITICAL (9.8).

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CVE-2026-111058

Description

Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. Prior to 3.2.6, default tokenless deployments allow anonymous clients to create Jupyter kernels and send execute_request messages containing arbitrary Python. The endpoint blocklist does not cover /api/kernels, and the websocket wrapper previously tracked idle activity without authorizing executable messages. This issue is fixed in version 3.2.6.