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Vulnerability · Published Apr 3, 2026 · Assigned by GitHub_M

CVE-2026-34771Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks

High 7.5

In plain English

A high-severity use-after-free in electron from electron. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 78.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmelectron38.8.6GHSA-8337-3p73-46f4
npmelectron39.8.0GHSA-8337-3p73-46f4
npmelectron40.7.0GHSA-8337-3p73-46f4
npmelectron41.0.0-beta.8GHSA-8337-3p73-46f4

Affected products (as reported)

VendorProductVersions
electron electron < 38.8.6>= 39.0.0-alpha.1, < 39.8.0>= 40.0.0-alpha.1, < 40.7.0>= 41.0.0-alpha.1, < 41.0.0-beta.8

Weakness: CWE-416, CWE-364 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References