CVE-2026-86504 in IntelliJ IDEA
Summary
by MITRE • 09/07/2026
In JetBrains IntelliJ IDEA before 2026.2.2 missing project-trust confirmation before building a Dev Container allowed host-level code execution
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Analysis
by VulDB Data Team • 09/07/2026
The vulnerability identified in versions of JetBrains IntelliJ IDEA prior to version 2026.2.2 represents a critical security flaw within the integrated development environment's handling of remote containerized workspaces, specifically those utilizing Docker Compose or similar orchestration tools for Dev Container configurations. This issue stems from an insufficient trust verification mechanism when initiating builds for projects configured as containers. In modern software development workflows, developers frequently utilize isolated environments to ensure consistency across different machines and deployment stages. IntelliJ IDEA facilitates this through its support for remote development contexts where the IDE connects to a container running on a host machine or within a cloud infrastructure. The core of the vulnerability lies in the application's failure to enforce a mandatory user confirmation step before executing build commands that interact with the underlying operating system of the host environment.
When a developer opens a project configured as a Dev Container, the Integrated Development Environment prepares various configuration files and scripts necessary for containerization. These configurations often include Dockerfiles or docker-compose.yml files which define how the container is built and what services it runs. Crucially, these build processes can involve mounting local directories from the host machine into the container filesystem. If an attacker gains access to a project repository that contains maliciously crafted configuration files, they could potentially exploit this lack of confirmation. By tricking a user or automated system into initiating a build process without explicit consent, the application may execute commands with elevated privileges on the host machine where IntelliJ IDEA is running. This bypasses standard security boundaries because the IDE assumes implicit trust in the project's integrity based solely on its location within trusted directories or previous usage patterns, rather than verifying the specific actions being taken against the host system.
The operational impact of this vulnerability is severe, as it allows for arbitrary code execution at the host level. An attacker who successfully exploits this flaw can execute commands with the same privileges as the user running IntelliJ IDEA. This could lead to unauthorized access to sensitive source code stored on the local machine, theft of credentials or API keys present in environment variables or configuration files, and further lateral movement within a corporate network if the developer's workstation is connected to internal resources. Furthermore, because build processes often run with administrative rights depending on system configurations, the potential for privilege escalation exists, allowing an attacker to gain full control over the host operating system. This transforms what appears as a standard development activity into a significant attack vector against both individual developers and enterprise environments relying on containerized workflows.
From a classification perspective, this vulnerability aligns with CWE-20 Improper Input Validation, specifically regarding the failure to validate inputs that trigger privileged operations without adequate user consent or verification. It also relates closely to CWE-94 Code Injection, as malicious configurations can inject unintended commands into the build process. In terms of adversary tactics, this flaw facilitates techniques associated with ATT&CK ID T1059 Command and Scripting Interpreter, where attackers use system utilities to execute code, and potentially T1203 Exploitation for Client Execution if leveraged through social engineering or malicious repository injection. The lack of a confirmation step is akin to CWE-78 Improper Neutralization of Special Elements used in an OS Command, although the primary failure here is procedural rather than purely syntactic, involving trust management and user interface security design flaws.
Mitigation strategies must focus on both immediate patching and long-term architectural changes within development workflows. The most effective remediation is to upgrade JetBrains IntelliJ IDEA to version 2026.2.2 or later, where the developers have implemented mandatory confirmation dialogs for operations that affect host-level resources during Dev Container builds. This ensures that users are explicitly aware of and consent to any actions that interact with their local file systems or execute system commands. Additionally, organizations should enforce strict code review policies for all Docker-related configuration files included in shared repositories. Developers must be trained to recognize suspicious patterns in docker-compose.yml or Dockerfile entries, such as unexpected volume mounts or command injections. Implementing static analysis tools specifically designed to detect insecure container configurations can also help identify potential risks before they are deployed into development environments. Finally, restricting the privileges of IDE processes where possible and using dedicated service accounts for automated builds can limit the blast radius should a vulnerability be exploited in future versions.