by Kastro
Paper/Archive/CVE-2026-111058

CVE-2026-111058

mljar mercury — Mercury: Unauthenticated Remote Code Execution via /api/kernels

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 44.3.443 × 208.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
mercury< 3.2.6–CNA

Scores by source

GitHub_M (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccqrefgithub.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1refgithub.com/mljar/mercury/releases/tag/3.2.6