CVE-2026-111058

CriticalCVSS 9.8

Published: 19/10/2026(UTC)Updated: 19/10/2026(UTC)Translated: 19/10/2026(UTC)NVD NIST

Summary

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.

Risk Assessment

An anonymous attacker can execute arbitrary Python code in the context of the Mercury process, leading to server compromise and data access. The risk is high for publicly exposed deployments.

Recommendation

Update Mercury to version 3.2.6 or later. Until patched, do not expose tokenless deployments on untrusted networks and restrict access to /api/kernels endpoints.

Other vulnerabilities in Mercury

CVE-2026-111057Critical
Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. From 3.0.0 until 3.2.4, a missing comma in BLOCKED_PATTERNS concatenates the /lab and /api/terminals regular-expression literals. Requests to /api/terminals therefore bypass the anonymous endpoint blocklist and reach Jupyter Server's terminal API. An unauthenticated attacker can use the resulting interactive operating-system shell to execute commands and access data available to the Mercury process.

Original NVD description (English source)

Vulnerability data from NVD (NIST) · CISA KEV · EPSS