CVE-2026-111058 Mercury - Remote Code Execution

Mercury < 3.2.6 contains a remote code execution caused by tokenless deployments allowing anonymous clients to create Jupyter kernels and send arbitrary execute_request messages, letting attackers execute arbitrary Python code remotely, exploit requires tokenless deployment.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
19 October 2026
Updated
20 October 2026
Weakness
CWE-862

Vendor fix

Update to version 3.2.6 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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