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CVE

CVE-2026-34771

Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks
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CVE

CVE-2026-34771

Electron: Use-after-free in WebContents fullscreen, pointer-lock, and keyboard-lock permission callbacks

Impact

Apps that register an asynchronous session.setPermissionRequestHandler() may be vulnerable to a use-after-free when handling fullscreen, pointer-lock, or keyboard-lock permission requests. If the requesting frame navigates or the window closes while the permission handler is pending, invoking the stored callback dereferences freed memory, which may lead to a crash or memory corruption.

Apps that do not set a permission request handler, or whose handler responds synchronously, are not affected.

Workarounds

Respond to permission requests synchronously, or deny fullscreen, pointer-lock, and keyboard-lock requests if an asynchronous flow is required.

Fixed Versions

  • 41.0.0-beta.8
  • 40.7.0
  • 39.8.0
  • 38.8.6

For more information

If there are any questions or comments about this advisory, please email security@electronjs.org

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/electron/electron/security/advisories/GHSA-8337-3p73-46f4, https://nvd.nist.gov/vuln/detail/CVE-2026-34771, https://github.com/electron/electron

Severity

7.5

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
7.5
EPSS Probability
0.0002%
EPSS Percentile
0.05743%
Introduced Version
0,41.0.0-alpha.1,40.0.0-alpha.2,39.0.0-alpha.1,1.3.1
Fix Available
38.8.6,41.0.0-beta.8,40.7.0,39.8.0

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