CVE-2026-13117: Technical Analysis of OpenVPN tls-crypt-v2 Heap Use-After-Free Vulnerability
By
HackMoN Ai
Summary
A detailed technical analysis of CVE-2026-13117, a critical heap use-after-free vulnerability in OpenVPN's tls-crypt-v2 mechanism. The vulnerability stems from a blind spot in a safety check during key renegotiation, allowing the server to free a buffer it is about to send and then transmit data from freed memory to the client. This opens the door to potential Remote Code Execution (RCE). The article explains the technical mechanics of the flaw, the affected component, and the implications for OpenVPN deployments.
Source
bskyCVE-2026-13117: Technical Analysis of OpenVPN tls-crypt-v2 Heap Use-After-Free Vulnerabilityundercodetesting.comKey quotes
· 3 pulledA safety check added specifically to prevent use-after-free conditions has a critical blind spot during key renegotiation.
This oversight allows the server to free a buffer it is about to send, then transmit whatever data now resides in that freed memory to the client — a classic heap use-after-free.
A single blind spot in a safety check opens the door to RCE.
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