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Vulnerability · Published Oct 19, 2026 · Assigned by GitHub_M

CVE-2026-111057Mercury: Unauthenticated Remote Code Execution in /api/terminals - access control bypass

Critical 10.0

In plain English

A critical-severity improper access control in mercury from mljar. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical
Exploit odds (30 days)0.7%top 46.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPImercury3.2.4GHSA-f8c7-rwf9-fmgm

Affected products (as reported)

VendorProductVersions
mljar mercury >= 3.0.0, < 3.2.4

Weakness: CWE-185, CWE-284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References