Electron: Context Isolation bypass via contextBridge VideoFrame transfer (CVE-2026-34780) | HOL Guard CVE

High · CVSS 8.3CVE-2026-34780

Electron: Context Isolation bypass via contextBridge VideoFrame transfer

Answer in brief

CVE-2026-34780 records a High severity (CVSS 8.3) vulnerability in Electron: Context Isolation bypass via contextBridge VideoFrame transfer. The current sources do not mark it as known exploited. The current feed maps electron/electron (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Apr 4, 2026Updated Jul 15, 2026Source checked Sep 19, 2026First seen by HOL Jul 15, 2026Material review Jul 15, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps electron/electron (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
electron/electrongeneric	>= 39.0.0-alpha.1, < 39.8.0 \|\| >= 40.0.0-alpha.1, < 40.7.0 \|\| >= 41.0.0-alpha.1, < 41.0.0-beta.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for electron/electron.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Apr 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 15, 2026

Sources and claim methodology

Upstream source description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From versions 39.0.0-alpha.1 to before 39.8.0, 40.0.0-alpha.1 to before 40.7.0, and 41.0.0-alpha.1 to before 41.0.0-beta.8, apps that pass VideoFrame objects (from the WebCodecs API) across the contextBridge are vulnerable to a context isolation bypass. An attacker who can execute JavaScript in the main world (for example, via XSS) can use a bridged VideoFrame to gain access to the isolated world, including any Node.js APIs exposed to the preload script. Apps are only affected if a preload script returns, resolves, or passes a VideoFrame object to the main world via contextBridge.exposeInMainWorld(). Apps that do not bridge VideoFrame objects are not affected. This issue has been patched in versions 39.8.0, 40.7.0, and 41.0.0-beta.8.

Quoted source text, attributed separately from HOL analysis.