What is CVE-2026-111057?

CVE-2026-111057 is a critical-severity vulnerability in Mljar Mercury, classified under Incorrect Regular Expression. CVSS score: 10.0/10. Published 2026-10-19.

How severe is CVE-2026-111057?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Vulnerability in Mljar Mercury

CVE-2026-111057

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. This issue is fixed in version 3.2.4.

Published 2026-10-19.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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.

Affected products

Mljar Mercury — versions >= 3.0.0, < 3.2.4

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-111057?: CVE-2026-111057 is a critical-severity vulnerability in Mljar Mercury, classified under Incorrect Regular Expression. CVSS score: 10.0/10. Published 2026-10-19.
How severe is CVE-2026-111057?: Critical severity. CVSS v3 base score is 10.0 out of 10.