CVE-2026-111057mercury Vulnerability
From 3.0.0 until 3.2.4, a missing comma in BLOCKED_PATTERNS concatenates the /lab and /api/terminals regular-expression literals.
Published Oct 19, 2026 · Updated Oct 19, 2026 · Also known as EUVD-2026-104419, GHSA-f8c7-rwf9-fmgm
Key Facts
Patch in the next maintenance window- CVE-2026-111057 is a critical-severity vulnerability (CVSS 10.0 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 3.2.4.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
Scores
CVSS v3.1
10.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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. 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 Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| mercurypypi | >= 3.0.0, >= >= 3.0.0, < 3.2.4 | 3.2.4 |
Patched Releases
mercury
3.2.4
Timeline
Publicly disclosed
Oct 19, 2026
Weakness Type
- CWE-185 Incorrect Regular Expression
- CWE-284 Improper Access Control
References
- advisoryGHSA advisory
- othergithub.com · 8c46712
- othergithub.com · v3.2.4
- othergithub.com · GHSA-f8c7-rwf9-fmgm
FAQ
Common Questions.
Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards.
Affected: mercury (pypi) versions >= 3.0.0, >= >= 3.0.0, < 3.2.4. 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 3.2.4.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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