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

Summary

CVE	CVE-2026-34771
State	PUBLISHED
Assigner	GitHub_M
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-04-04 00:16:17 UTC
Updated	2026-06-30 03:18:58 UTC
Description	Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8, 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. This issue has been patched in versions 38.8.6, 39.8.0, 40.7.0, and 41.0.0-beta.8.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS: 0.000390000 probability, percentile 0.117040000 (date 2026-04-07)

Problem Types: CWE-416 | CWE-364 | CWE-416 CWE-416: Use After Free | CWE-364 Signal Handler Race Condition

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Primary	8.8	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`
3.1	ADP	CVSS	7.5	HIGH	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`
3.1	[email protected]	Secondary	7.5	HIGH	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`
3.1	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	Secondary	7.5	HIGH	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`
3.1	CNA	DECLARED	7.5	HIGH	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Electronjs	Electron	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Electron	Electron	affected < 38.8.6	Not specified
CNA	Electron	Electron	affected >= 39.0.0-alpha.1, < 39.8.0	Not specified
CNA	Electron	Electron	affected >= 40.0.0-alpha.1, < 40.7.0	Not specified
CNA	Electron	Electron	affected >= 41.0.0-alpha.1, < 41.0.0-beta.8	Not specified
ADP	Red Hat	Red Hat Build Of Podman Desktop	Not specified	Not specified
ADP	Red Hat	Red Hat Build Of Podman Desktop - Tech Preview	Not specified	Not specified

References

Reference	Source	Link	Tags
bugzilla.redhat.com/show_bug.cgi	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	bugzilla.redhat.com
access.redhat.com/security/cve/CVE-2026-34771	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
github.com/electron/electron/security/advisories/GHSA-8337-3p73-46f4	[email protected]	github.com	Vendor Advisory
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34771.json	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	security.access.redhat.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
ADP	2026-04-04T00:00:54.679Z	Reported to Red Hat.
ADP	2026-04-03T23:47:23.171Z	Made public.

Workarounds

ADP: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

There are currently no legacy QID mappings associated with this CVE.