CVE-2026-123831 · Other
NO FIX YET · SEE WHAT TO DO
JetBrains CLion, a C and C++ IDE, could run attacker-supplied code through Meson project settings even when Safe Mode was on. An attacker who gets a developer to open a crafted project can run code on that developer's machine.
first public Nov 6, 2026 · 1 source
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Developers who open CLion projects that use Meson build settings, especially projects from untrusted sources, because Safe Mode did not block the code path. Teams that only open their own trusted projects are less exposed but should still update. The sources do not say whether the flaw is reachable without opening a project.
Not affected if trusted-projects-only, updated-ide
Who cares c++, clion, developer-tools, jetbrains, meson
2026.2 and 2026.1.4 is affected; move to 2026.2 or 2026.1.4 or later.In JetBrains CLion before 2026.2, 2026.1.4 code execution was possible in Safe Mode via Meson project settings
This page as .md · .json · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
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