CVE-2026-34780: Electron Context Isolation Bypass Vulnerability

HIGH
Advisory Identifier: GHSA-jfqg-hf23-qpw2
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CVSS 8.3
CWE-668 CWE-1188
Published
Advisory Summary

CVE-2026-34780 is a HIGH (CVSS 8.3) context isolation bypass vulnerability (CWE-668: Exposure of Resource to Wrong Sphere) affecting Electron libraries in the npm ecosystem. The issue involves context isolation bypass via contextbridge videoframe transfer. Remediation is available by upgrading affected packages to version 39.8.0, 40.7.0, 41.0.0-beta.8.

CVE-2026-34780 at a Glance

CVE Identifier CVE-2026-34780
GHSA Identifier GHSA-jfqg-hf23-qpw2
Severity HIGH
CVSS v3.1 Base Score 8.3
CWE Classification CWE-668: Exposure of Resource to Wrong Sphere
Affected Product Electron
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 8.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-34780

To remediate this vulnerability, upgrade all affected Electron dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

electron fixed: 39.8.0 
npm install electron@39.8.0
electron fixed: 40.7.0 
npm install electron@40.7.0
electron fixed: 41.0.0-beta.8 
npm install electron@41.0.0-beta.8
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls electron

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-34780, inspect your project dependencies using npm:

npm ls electron

Analyze the terminal output to locate any version of Electron in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 39.8.0), your application is affected.

Note: The npm ls electron command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-668: Exposure of Resource to Wrong Sphere, where the product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource. In Electron, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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. ### 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 [security@electronjs.org](mailto:security@electronjs.org)

CVE-2026-34780 Affected Electron Versions

3 component(s)
Fixed Versions:
39.8.040.7.041.0.0-beta.8
Product / Package Ecosystem Affected Versions Fixed Version
electron
npm/electron
npm
≥ 39.0.0-alpha.1
< 39.8.0
39.8.0
electron
npm/electron
npm
≥ 40.0.0-alpha.1
< 40.7.0
40.7.0
electron
npm/electron
npm
≥ 41.0.0-alpha.1
< 41.0.0-beta.8
41.0.0-beta.8

References

GitHub Advisory / Wiki ADVISORY
https://github.com/electron/electron/security/advisories/GHSA-jfqg-hf23-qpw2
NVD — CVE-2026-34780 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-34780
Electron Source Repository REPOSITORY
https://github.com/electron/electron

Frequently Asked Questions

What is CVE-2026-34780?
CVE-2026-34780 is a security vulnerability in Electron involving Context Isolation bypass via contextBridge VideoFrame transfer under CWE-668: Exposure of Resource to Wrong Sphere.
Which Electron versions are affected?
Affected versions include releases prior to 39.8.0, 40.7.0, 41.0.0-beta.8 across affected packages: electron.
What version fixes CVE-2026-34780?
Upgrading to 39.8.0, 40.7.0, 41.0.0-beta.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is electron affected?
Yes, electron is affected in releases prior to 39.8.0, 40.7.0, 41.0.0-beta.8. Upgrade your dependency to 39.8.0, 40.7.0, 41.0.0-beta.8 or later.
What is the CVSS score of CVE-2026-34780?
CVE-2026-34780 has a CVSS v3.1 base score of 8.3 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-34780?
CVE-2026-34780 is classified under CWE-668: Exposure of Resource to Wrong Sphere (The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.).
How can I check npm dependencies for CVE-2026-34780?
Run the dependency tree command: 'npm ls electron'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-jfqg-hf23-qpw2",
  "modified" : "2026-04-06T23:11:50Z",
  "published" : "2026-04-03T02:46:56Z",
  "aliases" : [ "CVE-2026-34780" ],
  "summary" : "Electron: Context Isolation bypass via contextBridge VideoFrame transfer",
  "details" : "### Impact\nApps 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.\n\nApps 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.\n\n### Workarounds\nDo not pass `VideoFrame` objects across `contextBridge`. If an app needs to transfer video frame data, serialize it to an `ArrayBuffer` or `ImageBitmap` before bridging.\n\n### Fixed Versions\n* `41.0.0-beta.8`\n* `40.7.0`\n* `39.8.0`\n\n### For more information\nIf there are any questions or comments about this advisory, please email [security@electronjs.org](mailto:security@electronjs.org)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "39.0.0-alpha.1"
      }, {
        "fixed" : "39.8.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "40.0.0-alpha.1"
      }, {
        "fixed" : "40.7.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "electron"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "41.0.0-alpha.1"
      }, {
        "fixed" : "41.0.0-beta.8"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/electron/electron/security/advisories/GHSA-jfqg-hf23-qpw2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-34780"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/electron/electron"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1188", "CWE-668" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-03T02:46:56Z",
    "nvd_published_at" : "2026-04-04T01:16:39Z"
  }
}