Bug 2455020 (CVE-2026-34780)

Summary: CVE-2026-34780 electron: Electron: Context Isolation bypass via VideoFrame object transfer
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Electron, a framework for building cross-platform desktop applications. An attacker capable of executing JavaScript in the main world, for instance through a cross-site scripting (XSS) vulnerability, could exploit this flaw. By passing VideoFrame objects from the WebCodecs API across the contextBridge, the attacker could bypass context isolation. This allows them to gain unauthorized access to the isolated world, including Node.js APIs exposed to the preload script, potentially leading to arbitrary code execution within the application.
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Bug Depends On: 2455448, 2455449    
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Description OSIDB Bzimport 2026-04-04 01:01:15 UTC 
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.