What is CVE-2026-111058?

CVE-2026-111058 is a critical-severity vulnerability, classified under Missing Authorization. CVSS score: 9.8/10. Published 2026-10-19.

How severe is CVE-2026-111058?

Critical severity. CVSS v3 base score is 9.8 out of 10.

CVE-2026-111058

CVE-2026-111058

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.

Vulnerability class: Broken Access Control

Published 2026-10-19 · last modified 2026-10-19.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

Frequently asked questions

What is CVE-2026-111058?: CVE-2026-111058 is a critical-severity vulnerability, classified under Missing Authorization. CVSS score: 9.8/10. Published 2026-10-19.
How severe is CVE-2026-111058?: Critical severity. CVSS v3 base score is 9.8 out of 10.