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CVE-2026-34774

CVE-2026-34774 · Electron: Use-after-free in offscreen child window paint callback

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 39.8.1, 40.7.0, and 41.0.0, apps that use offscreen rendering and allow child windows via window.open() may be vulnerable to a use-after-free. If the parent offscreen WebContents is destroyed while a child window remains open, subsequent paint frames on the child dereference freed memory, which may lead to a crash or memory corruption. Apps are only affected if they use offscreen rendering (webPreferences.offscreen: true) and their setWindowOpenHandler permits child windows. Apps that do not use offscreen rendering, or that deny child windows, are not affected. This issue has been patched in versions 39.8.1, 40.7.0, and 41.0.0.

CVSS 8.1 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • electron

    Versions
    • < 39.8.1: Affected
    • >= 40.0.0-alpha.1, < 40.7.0: Affected
    • >= 41.0.0-alpha.1, < 41.0.0: Affected

    No fix published

  • electron npm

    Affected ranges
    • SEMVER: < 39.8.1

    Update to 39.8.1

  • electron npm

    Affected ranges
    • SEMVER: ≥ 40.0.0-alpha.1, < 40.7.0

    Update to 40.7.0

  • electron npm

    Affected ranges
    • SEMVER: ≥ 41.0.0-alpha.1, < 41.0.0

    Update to 41.0.0

Original sources

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