CVE-2026-31893— Tunnelblick arbitrary file read via symlink following in tunnelblickd
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I. Basic Information for CVE-2026-31893
Vulnerability Information
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Vulnerability Title
Tunnelblick arbitrary file read via symlink following in tunnelblickd
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-61
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Tunnelblick | Tunnelblick | >= 3.3beta26, < 9.0beta02 | - |
II. Public POCs for CVE-2026-31893
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: Tunnelblick
Same weakness: CWE-61
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V. Comments for CVE-2026-31893
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