Vulnerability details

CVE-2026-111058

mljar mercury

Mercury: Unauthenticated Remote Code Execution via /api/kernels

CVSS 3.1

9.8Critical

Official 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 scores

Score	Version	Source	Vector
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
mljar	mercury	< 3.2.6	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccq x_refsource_CONFIRM
https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1 x_refsource_MISC
https://github.com/mljar/mercury/releases/tag/3.2.6 x_refsource_MISC

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Details

Published: 2026-10-19
Last updated: 2026-10-19
State: Published
Assigner (CNA): GitHub_M
Kolun priority: 26 · Low

Exploit prediction (EPSS)

0.52%

Probability of exploitation in 30 days

44.6%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-862
Missing Authorization