CVE-2026-34774
Electron: Use-after-free in offscreen child window paint callback
Description
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 39.8.1, 40.7.0, and 41.0.0, apps that use offscreen rendering and allow child windows via window.open() may be vulnerable to a use-after-free. If the parent offscreen WebContents is destroyed while a child window remains open, subsequent paint frames on the child dereference freed memory, which may lead to a crash or memory corruption. Apps are only affected if they use offscreen rendering (webPreferences.offscreen: true) and their setWindowOpenHandler permits child windows. Apps that do not use offscreen rendering, or that deny child windows, are not affected. This issue has been patched in versions 39.8.1, 40.7.0, and 41.0.0.
INFO
Published Date :
April 4, 2026, 12:16 a.m.
Last Modified :
July 24, 2026, 10:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
- Update Electron to version 39.8.1 or later.
- Update Electron to version 40.7.0 or later.
- Update Electron to version 41.0.0 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34774.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34774 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34774
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34774 vulnerability anywhere in the article.
-
Daily CyberSecurity
Breaking the App Shell: Five New Electron Vulnerabilities Shatter Context Isolation
The Electron framework—the powerhouse behind heavyweights like Visual Studio Code and countless other cross-platform desktop applications —has released a series of important patches to address five si ... Read more
The following table lists the changes that have been made to the
CVE-2026-34774 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: electron, Description: Electron es un framework para escribir aplicaciones de escritorio multiplataforma usando JavaScript, HTML y CSS. Antes de las versiones 39.8.1, 40.7.0 y 41.0.0, las aplicaciones que usan renderizado fuera de pantalla y permiten ventanas secundarias a través de window.open() pueden ser vulnerables a un uso después de liberación. Si el WebContents padre fuera de pantalla es destruido mientras una ventana secundaria permanece abierta, los subsiguientes fotogramas de pintura en la ventana secundaria desreferencian memoria liberada, lo que puede llevar a un fallo o corrupción de memoria. Las aplicaciones solo se ven afectadas si usan renderizado fuera de pantalla (webPreferences.offscreen: true) y su setWindowOpenHandler permite ventanas secundarias. Las aplicaciones que no usan renderizado fuera de pantalla, o que deniegan ventanas secundarias, no se ven afectadas. Este problema ha sido parcheado en las versiones 39.8.1, 40.7.0 y 41.0.0. -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:podman_desktop:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Podman Desktop', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:podman_desktop:0'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Podman Desktop - Tech Preview', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:podman_desktop:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Podman Desktop', 'packageName': 'podman-desktop-macos-1-0', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:podman_desktop:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Podman Desktop', 'packageName': 'podman-desktop-windows-1-0', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:podman_desktop:0'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Podman Desktop - Tech Preview', 'packageName': 'rhdesktop/rh-podman-desktop-ext-openshift-local-rhel10', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:podman_desktop:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Podman Desktop', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:podman_desktop:0'], 'vendor': 'Red Hat', 'product': 'Red Hat Build of Podman Desktop - Tech Preview', 'defaultStatus': 'affected'}] Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-825 Added Reference https://access.redhat.com/security/cve/CVE-2026-34774 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2455026 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34774.json -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-34774', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-04-07T00:00:00+00:00'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'electron', 'product': 'electron', 'versions': [{'status': 'affected', 'version': '< 39.8.1'}, {'status': 'affected', 'version': '>= 40.0.0-alpha.1, < 40.7.0'}, {'status': 'affected', 'version': '>= 41.0.0-alpha.1, < 41.0.0'}]}] -
Initial Analysis by [email protected]
Apr. 22, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:electronjs:electron:41.0.0:alpha1:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:alpha2:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:alpha3:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:alpha4:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:alpha5:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:alpha6:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:beta1:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:beta2:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:beta3:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:beta4:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:beta5:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:beta6:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:41.0.0:beta7:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:* versions from (including) 40.0.0 up to (excluding) 40.7.0 *cpe:2.3:a:electronjs:electron:41.0.0:beta8:*:*:*:node.js:*:* *cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:* versions up to (excluding) 39.8.1 Added Reference Type GitHub, Inc.: https://github.com/electron/electron/security/advisories/GHSA-532v-xpq5-8h95 Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 04, 2026
Action Type Old Value New Value Added Description Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 39.8.1, 40.7.0, and 41.0.0, apps that use offscreen rendering and allow child windows via window.open() may be vulnerable to a use-after-free. If the parent offscreen WebContents is destroyed while a child window remains open, subsequent paint frames on the child dereference freed memory, which may lead to a crash or memory corruption. Apps are only affected if they use offscreen rendering (webPreferences.offscreen: true) and their setWindowOpenHandler permits child windows. Apps that do not use offscreen rendering, or that deny child windows, are not affected. This issue has been patched in versions 39.8.1, 40.7.0, and 41.0.0. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added Reference https://github.com/electron/electron/security/advisories/GHSA-532v-xpq5-8h95