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[ CVE-2026-111058 · Published 19 Oct 2026 ]

Mercury: Unauthenticated Remote Code Execution via /api/kernels

CVSS 9.8 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Critical severity: CVSS 9.8

[ Description ]Official 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.

[ Fixes ]Fixes and patches

  • mercury 3.2.6Fixed version · GitHub Advisories · pip package mercury: upgrade to 3.2.6 or later (affected <= 3.2.5)

[ Packages ]Affected open-source packages

[ References ]References