Description

In JetBrains CLion before 2026.3, 2026.2.4.1 missing authentication allowed local users to obtain the debug session environment on Linux

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.0",
  "pubDate": "2026-11-06T11:17:05.873Z",
  "pubdate": "2026-11-06T11:17:05.873Z",
  "executiveSummary": "This vulnerability involves a missing authentication mechanism in JetBrains CLion, affecting versions prior to 2026.3 and 2026.2.4.1.\nThe flaw allows unauthorized local users on Linux systems to gain access to sensitive information stored within the active debug session environment.\nThe vulnerability type is categorized as a missing authentication flaw, which enables local privilege escalation or sensitive data disclosure concerning the internal state of the debugger.\nBy bypassing access controls, an attacker with local system access can retrieve environmental variables, command-line arguments, or potentially cryptographic material utilized during the debugging process.\nThe risk implication is significant for development environments where debug sessions may process sensitive source code, API keys, or infrastructure credentials.\nExploitation requires no remote network access, relying strictly on the attacker's ability to interface with the local environment where the CLion process is executing.",
  "technicalDetails": "The vulnerability originates from a failure to enforce strict access control checks on the inter-process communication (IPC) or local socket interfaces used by CLion to manage debug sessions on Linux distributions.\nIn the affected versions, the mechanisms intended to mediate access to the debug environment do not verify the identity or security context of the requesting process or user.\nConsequently, any user sharing the same Linux environment—such as a multi-user server or a compromised low-privilege account—can interact with the CLion debug socket.\nThe attack flow proceeds as follows: An attacker identifies an active instance of CLion running under a target user account. By leveraging the improperly secured local interface, the attacker sends a request to the debug controller. Because the application lacks authentication requirements, it treats the request as legitimate and returns the internal debug session state to the unauthorized requester.\nThis state may include the full environment block of the process being debugged, which frequently contains sensitive information such as system PATHs, environment variables containing secrets, and memory-mapped configuration data.\nThe vulnerable component is the debugger's communication backend responsible for interacting with the local filesystem or kernel-level debugging hooks. By intercepting these communications, an attacker can effectively clone or inspect the debug session, potentially leading to the leakage of proprietary source code or production environment configurations.\nThe lack of authentication means that the application fails to distinguish between the legitimate owner of the process and a malicious local actor. This is particularly critical on Linux, where default permissions on certain IPC mechanisms may be loosely configured if the application itself does not enforce secondary validation.\nPost-exploitation, an attacker can continuously monitor the debug session, facilitating persistent unauthorized access to the environment variables and memory contents of the application under development. This access does not require administrative privileges, merely local shell access on the same host system."
}