CVE-2026-111058

CRITICAL9.8

Mercury: Unauthenticated Remote Code Execution via /api/kernels

Published Oct 19, 2026

Modified Today

Details

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.

References

WEB

https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1

WEB

https://github.com/mljar/mercury/releases/tag/3.2.6

WEB

https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccq

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-111058

CVSS Analysis

CVSS v3.1

9.8