CVE-2026-123831

Summary

In JetBrains CLion before 2026.2, a code execution flaw (CWE-829) allowed attackers to execute arbitrary code in Safe Mode by manipulating Meson project settings, bypassing intended safety restrictions.

Exploitability

Exploitation requires user interaction (e.g., opening a malicious project or accepting unsafe project settings) and only affects CLion instances configured to run in Safe Mode with Meson support enabled.

Blast radius

Successful exploitation could lead to full system compromise, including data theft, malware deployment, or lateral movement within the developer’s environment.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Upgrade to CLion 2026.2 or later, or apply patch level 2026.1.4 if already on the 2026.1.x series.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.