CVE WatchJul 25, 2026

CVE-2026-31893

Tunnelblick is an open source graphic user interface for OpenVPN on macOS. In versions 3.3beta26 through 9.0beta01, any local user can read

CVSS

5.5

Medium

EPSS

0.2%

p15

KEV

—

Exploit Today

0-100

Published: May 5, 2026 · Last modified: Jul 25, 2026 · CWE-61

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-302026-08-26

Technical 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.

Official references

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