CVE-2026-111058mercury Missing Authorization
Prior to 3.2.6, default tokenless deployments allow anonymous clients to create Jupyter kernels and send execute_request messages containing arbitrary Python.
Published Oct 19, 2026 · Updated Oct 19, 2026 · Also known as EUVD-2026-104420, GHSA-rv4m-xm3f-3ccq
Key Facts
Patch in the next maintenance window- CVE-2026-111058 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting mercury (pypi).
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- Fixed versions are available, including mercury 3.2.6.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
n/a
Exploit maturity
Proof of concept
ATLAS score
39/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryGHSA advisory
Description
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| mercurypypi | >= < 3.2.6 | 3.2.6 |
Patched Releases
mercury
3.2.6
Timeline
Publicly disclosed
Oct 19, 2026
Weakness Type
- CWE-862 Missing Authorization
References
- advisoryGHSA advisory
- othergithub.com · 73a40ce
- othergithub.com · 3.2.6
- othergithub.com · GHSA-rv4m-xm3f-3ccq
FAQ
Common Questions.
Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards.
Affected: mercury (pypi) versions >= < 3.2.6. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including mercury 3.2.6.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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