---
id: "CVE-2026-123281"
page: "https://infrastack.ai/live/CVE-2026-123281"
kind: "vulnerability"
aliases: ["CVE-2026-123281"]
title: "JetBrains Datalore: notebook code can run commands in sidecar container"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["datalore", "jetbrains", "other", "self-hosted"]
not_affected_if: ["version-2026.4-or-later"]
published_at: "2026-11-06T11:17:06+00:00"
first_seen_at: "2026-11-06T11:41:24+00:00"
updated_at: "2026-11-06T11:42:06+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123281", "first_seen_at": "2026-11-06T11:41:24+00:00"}]
exploit_sources: []
---

# JetBrains Datalore: notebook code can run commands in sidecar container

Link for people: https://infrastack.ai/live/CVE-2026-123281 (this .md is for agents)

In JetBrains Datalore before 2026.4, code run in a notebook could execute commands in the sidecar container through the mount broker. The sources give no further detail on the attack path.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Datalore version against `2026.4`

## Fix

- Datalore: move to `2026.4` or later (per the advisory summary; confirm against the vendor page)

## Timeline

- 2026-11-06T11:41:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123281

## From the sources

In JetBrains Datalore before 2026.4 notebook code could execute commands in the sidecar container via the mount broker

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_