CVE-2026-34780

Workarounds

Do not pass VideoFrame objects across contextBridge. If an app needs to transfer video frame data, serialize it to an ArrayBuffer or ImageBitmap before bridging.

Fixed Versions

• 41.0.0-beta.8
• 40.7.0
• 39.8.0

For more information

If there are any questions or comments about this advisory, please email [email protected]

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.

CVE-2026-34780 has a CVSS score of 8.3 (High). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (39.8.0, 40.7.0, 41.0.0-beta.8); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is CVE-2026-34780? CVE-2026-34780 is a high-severity security vulnerability in electron (npm), affecting versions >= 39.0.0-alpha.1, < 39.8.0. It is fixed in 39.8.0, 40.7.0, 41.0.0-beta.8.
2. How severe is CVE-2026-34780? CVE-2026-34780 has a CVSS score of 8.3 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of electron are affected by CVE-2026-34780? electron (npm) versions >= 39.0.0-alpha.1, < 39.8.0 is affected.
4. Is there a fix for CVE-2026-34780? Yes. CVE-2026-34780 is fixed in 39.8.0, 40.7.0, 41.0.0-beta.8. Upgrade to this version or later.
5. Is CVE-2026-34780 exploitable, and should I be worried? Whether CVE-2026-34780 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-34780 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-34780?
   • Upgrade electron to 39.8.0 or later
   • Upgrade electron to 40.7.0 or later
   • Upgrade electron to 41.0.0-beta.8 or later