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CVE-2026-34780: Electron: Context Isolation bypass via contextBridge VideoFrame transfer

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-04 · updated 2026-07-24
• Weakness: CWE-668

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.

Affected products

• electron: from 39.0.0 before 39.8.0; from 40.0.0 before 40.7.0; 41.0.0-alpha1, 41.0.0-alpha2, 41.0.0-alpha3, 41.0.0-alpha4, 41.0.0-alpha5, 41.0.0-alpha6 (+7) — fixed in 39.8.0, 40.7.0

How to fix

Upgrade to a fixed version: electron 39.8.0, 40.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/electron/electron/security/advisories/GHSA-jfqg-hf23-qpw2
• https://access.redhat.com/security/cve/CVE-2026-34780
• https://bugzilla.redhat.com/show_bug.cgi?id=2455020
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34780.json

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