Overview
JetBrains has disclosed a critical remote code execution vulnerability in IntelliJ IDEA, one of the world's most widely used Java and Kotlin IDEs. Tracked as CVE-2026-59792 with a CVSS score of 9.6 (Critical), the vulnerability allows an attacker to execute arbitrary code on a developer's machine by exploiting path traversal in how IntelliJ IDEA handles project workspace IDs.
Vulnerability Details
Path Traversal in Workspace ID Handling
When IntelliJ IDEA processes project workspace identifiers, it fails to properly sanitize path components. A maliciously crafted project or workspace ID containing directory traversal sequences (e.g., ../) can cause the IDE to read, write, or execute files outside the intended project directory.
This class of vulnerability is particularly dangerous in a developer tool context because:
- Developer trust model: IDEs operate with elevated implicit trust — developers routinely open projects from colleagues, GitHub repositories, or CI/CD pipelines
- High-privilege execution: The IDE typically runs with full user privileges
- Supply chain risk: A malicious repository opened in the IDE can trigger code execution before the developer reviews a single line
Attack Vectors
The vulnerability can be exploited through:
- Malicious project files: A crafted
.idea/workspace configuration triggers the traversal on project open - Repository cloning: Opening a repository containing a weaponized workspace ID structure
- Shared project imports: Any workflow where an attacker controls the workspace ID value passed to IntelliJ
Impact
- Remote code execution with the privileges of the IDE process (typically the logged-in user)
- Full developer workstation compromise — credential theft, source code exfiltration, lateral movement
- Supply chain attack surface — poisoned repositories can auto-execute code when opened
Affected Versions
| Branch | Vulnerable | Patched |
|---|---|---|
| 2026.1.x | All versions before 2026.1.4 | 2026.1.4+ |
| 2026.2 | Not affected (fixed in initial release) | 2026.2+ |
| Earlier branches | Status unclear — update recommended | — |
Remediation
Update IntelliJ IDEA immediately:
- Open IntelliJ IDEA
- Navigate to Help → Check for Updates
- Install version 2026.1.4 or upgrade to 2026.2
Alternatively, download the latest release directly from JetBrains Toolbox App.
Interim Mitigations
If immediate patching is not possible:
- Only open projects from fully trusted sources — avoid opening repositories from unknown contributors
- Review
.idea/directory contents before opening a project in a text editor - Use a sandboxed VM or container for evaluating untrusted code repositories
Developer Awareness
This vulnerability underscores a growing threat category: IDE-as-attack-surface. As development tooling becomes more powerful (AI code assistants, auto-execution of project configs, remote development), the security posture of developer tools becomes critical infrastructure security.