by Kastro
Paper/Archive/CVE-2026-111057

CVE-2026-111057

mljar mercury — Mercury: Unauthenticated Remote Code Execution in /api/terminals - access control bypass

EPSS 0.7%public exploitCVSS 10.0
critical.is priorityof 100
51
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 53.0.530 × 2010.6Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

Mercury is a Python framework for sharing Jupyter notebooks as web applications and dashboards. From 3.0.0 until 3.2.4, a missing comma in BLOCKED_PATTERNS concatenates the /lab and /api/terminals regular-expression literals. Requests to /api/terminals therefore bypass the anonymous endpoint blocklist and reach Jupyter Server's terminal API. An unauthenticated attacker can use the resulting interactive operating-system shell to execute commands and access data available to the Mercury process. This issue is fixed in version 3.2.4.

Affected

ProductAffectedFixed inSource
mercury>= 3.0.0, < 3.2.4–CNA

Scores by source

GitHub_M (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/mljar/mercury/security/advisories/GHSA-f8c7-rwf9-fmgmrefgithub.com/mljar/mercury/commit/8c467129037ee9df269d543ac217ffd33b97bf3frefgithub.com/mljar/mercury/releases/tag/v3.2.4