---
title: "CVE-2026-111058: Mercury - Remote Code Execution"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-111058/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-111058)

## 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](https://cwe.mitre.org/data/definitions/862.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-111058](https://nvd.nist.gov/vuln/detail/CVE-2026-111058)
- [https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1](https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1)
- [https://github.com/mljar/mercury/releases/tag/3.2.6](https://github.com/mljar/mercury/releases/tag/3.2.6)
- [https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccq](https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccq)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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