CVE-2026-31893
Description
Tunnelblick is an open source graphic user interface for OpenVPN on macOS. In versions 3.3beta26 through 9.0beta01, any local user can read arbitrary root-owned files by exploiting a symlink following vulnerability in tunnelblick-helper, reachable through the world-accessible tunnelblickd Unix socket. The socket is configured with mode 0666, allowing any local user to connect. No authorization check is performed on the connecting client. The tunnelblick-helper process constructs a path to config.ovpn inside a user-controlled .tblk directory and reads it as root without symlink validation. An attacker can create a .tblk configuration with a symlinked config.ovpn pointing to any file and request tunnelblickd to read it. This issue has been fixed in versions 9.0beta02.
How to fix
- tunnelblick tunnelblick8.0.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| tunnelblick tunnelblick | 3.5.3 ≤ v < 8.0.1, 3.3, 8.1, 9.0 | 8.0.1 |
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