CVE-2026-111058

Mercury: Unauthenticated Remote Code Execution via /api/kernels

At a glance

Severity: CRITICAL 9.8
EPSS: EPSS 0.52 % · percentile 44 (2026-10-27)
State: PUBLISHED
Published: 2026-10-19
Updated: 2026-10-19
Assigner: GitHub_M
NVD status: Awaiting Analysis

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub_M
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · security-advisories@github.com (Secondary)

Weaknesses (CWE)

CWE-862

Advisories

GHSA-rv4m-xm3f-3ccq — Mercury: Unauthenticated Remote Code Execution via /api/kernels

European references

ENISA EUVD · EUVD-2026-104420
GCVE · GCVE-0-2026-111058

Affected products

Product	Versions
mljar · mercury	affected < 3.2.6

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD