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High, CVSS 8.1amended

Electron: Use-after-free in offscreen child window paint callback

CVE-2026-34774GHSA-532v-xpq5-8h95

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (electron 41.0.0, 40.7.0, 39.8.1), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm electron

    Affected
    < 39.8.1>= 40.0.0-alpha.1, < 40.7.0>= 41.0.0-alpha.1, < 41.0.0
    Fixed in
    41.0.0, 39.8.1, 40.7.0

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.1 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2026-34774: 0.45% estimated exploitation activity in the next 30 days; percentile 39.33 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Impact 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. Workarounds Deny child window creation from offscreen renderers in your setWindowOpenHandler, or ensure child windows are closed before the parent is destroyed. Fixed Versions 41.0.0 40.7.0 39.8.1 For more information If there are any questions or comments about this advisory, please email security@electronjs.org

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-532v-xpq5-8h95

  2. Revision 1 · created ·

    Published from osv record GHSA-532v-xpq5-8h95

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-34774

Advisory: Electron: Use-after-free in offscreen child window paint callback
IDs: CVE-2026-34774, GHSA-532v-xpq5-8h95
Record: https://patchnext.com/advisories/cve-2026-34774 (revision 2, source checked 26 Oct 2026, 12:47 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: electron 41.0.0, 40.7.0, 39.8.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm electron: affected < 39.8.1; >= 40.0.0-alpha.1, < 40.7.0; >= 41.0.0-alpha.1, < 41.0.0; fixed in 41.0.0, 39.8.1, 40.7.0

## Suggested inspection (read-only)
- `npm ls electron --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on electron.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-532v-xpq5-8h95 (OSV record GHSA-532v-xpq5-8h95 lists affected ranges: npm electron >=0 =40.0.0-alpha.1 =41.0.0-alpha.1 <41.0.0 (fixed))
- Verified: https://github.com/advisories/GHSA-532v-xpq5-8h95 (GitHub-reviewed advisory GHSA-532v-xpq5-8h95 lists affected ranges: npm electron >=0 =40.0.0-alpha.1 =41.0.0-alpha.1 <41.0.0)

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