Critical severity · published Oct 19, 2026
CVE-2026-111058
Mercury: Unauthenticated Remote Code Execution via /api/kernels
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ME
mercury · mljar
< 3.2.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-111058
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-111058
github.com
https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1
github.com
https://github.com/mljar/mercury/releases/tag/3.2.6
github.com
https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccq
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