CVE-2026-65908 in PyCharm
Summary
by MITRE • 07/23/2026
In JetBrains PyCharm before 2026.1.4, 2026.2 arbitrary code execution via malicious Python executable was possible on untrusted project open
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Analysis
by VulDB Data Team • 07/23/2026
This vulnerability in JetBrains PyCharm versions prior to 2026.1.4 represents a critical security flaw that allows attackers to execute arbitrary code when opening untrusted Python projects. The issue stems from insufficient input validation and sanitization during the project opening process, particularly when handling malicious Python executables. When users open compromised projects, the IDE fails to properly isolate or validate the code contained within these executables, creating a pathway for remote code execution attacks. The vulnerability operates at the application level where PyCharm's project loading mechanism does not adequately protect against malicious code injection, making it particularly dangerous for developers who frequently work with external or untrusted code repositories.
The technical implementation of this flaw involves the IDE's handling of Python executable files within project structures, where it attempts to parse and execute code without proper security boundaries. This behavior aligns with CWE-472 Unprotected Primary Resource and CWE-94 Improper Control of Generation of Code, as the application fails to properly control the execution flow when processing external Python code. Attackers can craft malicious Python executables that contain payload code designed to exploit this weakness during normal IDE operations, particularly when projects are opened or loaded automatically. The vulnerability essentially allows attackers to bypass standard security controls that would normally prevent code execution from untrusted sources.
The operational impact of this vulnerability extends beyond individual developer machines to potentially compromise entire development environments and corporate networks. When developers open compromised projects, the malicious code executes with the privileges of the user running PyCharm, which could range from limited user permissions to elevated system access depending on the environment. This presents significant risks for organizations relying on PyCharm for software development, as it could serve as an initial access vector for more sophisticated attacks or as a method for privilege escalation within development environments. The vulnerability is particularly concerning because it can be triggered automatically during project loading processes without requiring user interaction beyond opening the project.
Mitigation strategies should focus on immediate patching to version 2026.1.4 or later, which addresses the core validation issues in project loading mechanisms. Organizations should implement strict project access controls and avoid opening untrusted projects from unknown sources. Security teams should monitor for suspicious project files and consider implementing sandboxed environments for opening potentially malicious code. Additional protective measures include configuring PyCharm's security settings to disable automatic execution of external code, enabling secure coding practices for project management, and conducting regular security assessments of development environments. From an ATT&CK framework perspective, this vulnerability maps to T1059 Command and Scripting Interpreter and T1203 Exploitation for Client Execution, highlighting the need for comprehensive endpoint protection and application control measures.