---
id: "CVE-2026-123847"
page: "https://infrastack.ai/live/CVE-2026-123847"
kind: "vulnerability"
aliases: ["CVE-2026-123847"]
title: "JetBrains IntelliJ IDEA: terminal completion lets control characters run commands"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["developer-tools", "intellij-idea", "jetbrains", "package"]
not_affected_if: ["version-2026.3-or-later"]
published_at: "2026-11-06T17:17:23+00:00"
first_seen_at: "2026-11-06T17:43:13+00:00"
updated_at: "2026-11-06T17:45:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123847", "first_seen_at": "2026-11-06T17:43:13+00:00"}]
exploit_sources: []
---

# JetBrains IntelliJ IDEA: terminal completion lets control characters run commands

Link for people: https://infrastack.ai/live/CVE-2026-123847 (this .md is for agents)

Before IntelliJ IDEA 2026.3, control characters in terminal command completion could cause command execution. An attacker who can supply crafted completion input may get a command run on the developer's machine.

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

## How to check

- Check the IDE version under Help > About in IntelliJ IDEA; versions before `2026.3` are listed as affected.

## Fix

- IntelliJ IDEA: move to `2026.3` or later (the sources name this version as the first fixed release).

## Timeline

- 2026-11-06T17:43:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123847

## From the sources

In JetBrains IntelliJ IDEA before 2026.3 command execution was possible via control characters in terminal command completion

---

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