Electron PermissionRequestHandler UAFO before v38.8.6, v39.8.0, v40.7.0, v41.0.0-beta.8
CVE-2026-34771 Published on April 3, 2026
Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8, apps that register an asynchronous session.setPermissionRequestHandler() may be vulnerable to a use-after-free when handling fullscreen, pointer-lock, or keyboard-lock permission requests. If the requesting frame navigates or the window closes while the permission handler is pending, invoking the stored callback dereferences freed memory, which may lead to a crash or memory corruption. Apps that do not set a permission request handler, or whose handler responds synchronously, are not affected. This issue has been patched in versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8.
Vulnerability Analysis
CVE-2026-34771 can be exploited with network access, requires user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Types
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-34771 has been classified to as a Dangling pointer vulnerability or weakness.
Signal Handler Race Condition
The software uses a signal handler that introduces a race condition.
Products Associated with CVE-2026-34771
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Affected Versions
electron:- Version < 38.8.6 is affected.
- Version >= 39.0.0-alpha.1, < 39.8.0 is affected.
- Version >= 40.0.0-alpha.1, < 40.7.0 is affected.
- Version >= 41.0.0-alpha.1, < 41.0.0-beta.8 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.