Out-of-Bounds Heap Read Vulnerability in Electron Framework on macOS and Linux

CVE-2026-34776

What is CVE-2026-34776?

The Electron framework, used for building cross-platform desktop applications, contains a vulnerability that affects specific versions on macOS and Linux. When apps utilize the app.requestSingleInstanceLock() method, they become susceptible to an out-of-bounds heap read when processing a specially crafted second-instance message. This flaw could result in sensitive memory being unintentionally exposed to the app's second-instance event handler, posing a significant privacy risk. It is vital to note that this vulnerability does not affect applications running on Windows, nor does it impact those that do not employ the app.requestSingleInstanceLock() function. Users and developers are encouraged to update to the latest patched versions—38.8.6, 39.8.1, 40.8.1, and 41.0.0—to mitigate the risks.

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