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Vulnerabilities

Vulnerability · CVE-2026-31893

Tunnelblick is an open source graphic user interface for OpenVPN on macOS.

Published May 5, 2026 · catalog updated Jul 25, 2026 · Tunnelblick is an open

Check if you run it

No confirmed exploitation is on record for CVE-2026-31893. EPSS is 0.19%. Act only if a listed version of Tunnelblick is an open is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Tunnelblick is an open).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.19%
Remediation
Advisory link
Affected products
cpe tunnelblick/tunnelblick

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe tunnelblick/tunnelblick3.3
  • cpe tunnelblick/tunnelblick8.1
  • cpe tunnelblick/tunnelblick9.0

How to fix CVE-2026-31893

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-31893. EPSS is 0.19%. Act only if a listed version of Tunnelblick is an open is installed.

Which versions are affected?

Compare what you have installed with 3.3, 8.1, 9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-61. EPSS 0.19%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 5, 2026 · NIST NVD

    Detected

    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 che

  2. Jul 25, 2026 · NIST NVD

    Updated

    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 che

Sources

  • CVE.orgVulnerability recordCVE-2026-31893

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-31893

    30-day exploitation probability 0.2%

    first.org
  • NIST NVDVulnerability recordCVE-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 arbitrary root-owned files by exploiting a symlink following vulnerability in tunnelblick-helper, reachable through the world-accessible tun

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.