CVE-2026-34772: Electron: Use-after-free in download save dialog callback
Impact Apps that allow downloads and programmatically destroy sessions may be vulnerable to a use-after-free. If a session is torn down while a native save-file dialog is open for a download, dismissing the dialog dereferences freed memory, which may lead to a crash or memory corruption.
Apps that do not destroy sessions at runtime, or that do not permit downloads, are not affected.
Workarounds Avoid destroying sessions while a download save dialog may be open. Cancel pending downloads before session teardown.
Fixed Versions 41.0.0-beta.7 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
Other sources
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 allow downloads and programmatically destroy sessions may be vulnerable to a use-after-free. If a session is torn down while a native save-file dialog is open for a download, dismissing the dialog dereferences freed memory, which may lead to a crash or memory corruption. Apps that do not destroy sessions at runtime, or that do not permit downloads, 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.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 41.0.0-beta.7 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 40.7.0 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 39.8.0 - Upgrade
Upgrade
npm/electronto a version that resolves this vulnerability.Fixed in 38.8.6 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 38.8.6 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 39.8.0 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 40.7.0 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 41.0.0-beta.7 - Configuration
Avoid destroying sessions while a download save dialog may be open. Cancel pending downloads before session teardown.
Electron app (session teardown/download handling) session teardown timing = Do not destroy/dismiss sessions while a download save dialog may be open; cancel pending downloads before session teardown