CVE-2026-111058CWE-862broken-access-control

CVE-2026-111058

Critical · published October 19, 2026

CVSS v3.1
9.8
EPSS
0%
Percentile
37.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00437 · 37.0th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-10-19T20:17Z
References (3)
https://github.com/mljar/mercury/commit/73a40ceb0becf057f495a5738ad7f5a5222a53e1 · [email protected]https://github.com/mljar/mercury/releases/tag/3.2.6 · [email protected]https://github.com/mljar/mercury/security/advisories/GHSA-rv4m-xm3f-3ccq · [email protected]
EPSS history
Timeline
  • 21 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 19 OCT 16:06Z
    Mercury: Unauthenticated Remote Code Execution via /api/kernels
    cvelistv5
  • 19 OCT 16:06Z
    Mercury: Unauthenticated Remote Code Execution via /api/kernels
    cvelistv5