CVE-2026-31893
Last modified
CVE-2026-31893 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Tunnelblick | Tunnelblick | >= 3.5.3, < 8.0.1 | — |
| Tunnelblick | Tunnelblick | 3.3 | Beta26 |
| Tunnelblick | Tunnelblick | 8.1 | Beta01 |
| Tunnelblick | Tunnelblick | 9.0 | Beta01 |
References
- https://github.com/Tunnelblick/Tunnelblick/releases/tag/v9.0beta02Product, Release Notes
- https://github.com/Tunnelblick/Tunnelblick/security/advisories/GHSA-927j-vcjf-hq69Exploit, Vendor Advisory
- https://github.com/Tunnelblick/Tunnelblick/security/advisories/GHSA-927j-vcjf-hq69Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-31893?
How severe is CVE-2026-31893?
How do I fix CVE-2026-31893?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-31888Shopware is an open commerce platform. Prior to 6.7.8.1 and …5.3
- CVE-2026-31889Shopware is an open commerce platform. Prior to 6.6.10.15 an…8.9
- CVE-2026-3189A weakness has been identified in feiyuchuixue sz-boot-paren…3.1
- CVE-2026-31890Inspektor Gadget is a set of tools and framework for data co…5.5
- CVE-2026-31891Cockpit is a headless content management system. Any Cockpit…6.5
- CVE-2026-31892Argo Workflows is an open source container-native workflow e…8.1
- CVE-2026-31894WeGIA is a web manager for charitable institutions. In 3.6.5…7.5
- CVE-2026-31895WeGIA is a web manager for charitable institutions. Prior to…8.8
- CVE-2026-31896WeGIA is a web manager for charitable institutions. Prior to…9.8
- CVE-2026-31897FreeRDP is a free implementation of the Remote Desktop Proto…9.1
- CVE-2026-31898jsPDF is a library to generate PDFs in JavaScript. Prior to …6.5
- CVE-2026-31899CairoSVG is an SVG converter based on Cairo, a 2D graphics l…7.5
Are you affected by CVE-2026-31893?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST