Critical 9.8Published Oct 19, 2026

CVE-2026-111058Mercury: Unauthenticated Remote Code Execution via /api/kernels

Updated under an hour ago (2026-10-21 03:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for mljar mercury

Exploited in the last 30 days

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: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

mljar mercury mljar:mercury (from the name)	before 3.2.6	CNA record

References

https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccqx-refsource-confirm
https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1x-refsource-misc
https://github.com/mljar/mercury/releases/tag/3.2.6x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.