Mercury: Unauthenticated Remote Code Execution via /api/kernels
Not on CISA's list of exploited flaws, and not in the news we track.
0.52%
Fix it in your code
Each opens with a short prompt that points at Global Hack Map's public runbook for CVE-2026-111058. Nothing runs until you send it.
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.