CVE-2026-34771Network attack vector

Crash or memory corruption via stale permission callback

Published Apr 3, 2026 · Updated Apr 3, 2026

Use-after-free in Electron allows remote attackers to crash affected desktop apps or corrupt memory through asynchronous permission requests. A pending session.setPermissionRequestHandler callback retains a frame or window reference that is freed when the frame navigates or the window closes, then dereferences it when invoked. Exposure requires an app to install that handler, answer asynchronously, and process a fullscreen, pointer-lock, or keyboard-lock request; apps without the handler or with synchronous responses are unaffected.

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Electron allows remote attackers to crash affected desktop apps or corrupt memory through asynchronous permission requests. A pending session.setPermissionRequestHandler callback retains a frame or window reference that is freed when the frame navigates or the window closes, then dereferences it when invoked. Exposure requires an app to install that handler, answer asynchronously, and process a fullscreen, pointer-lock, or keyboard-lock request; apps without the handler or with synchronous responses are unaffected.

The record

CVE
CVE-2026-34771
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
Electron
Product
Electron
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 38.8.6
  2. Affected versionversion=>= 39.0.0-alpha.1, < 39.8.0
  3. Affected versionversion=>= 40.0.0-alpha.1, < 40.7.0
  4. Affected versionversion=>= 41.0.0-alpha.1, < 41.0.0-beta.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Electron · Electronversion=< 38.8.6; version=>= 39.0.0-alpha.1, < 39.8.0; version=>= 40.0.0-alpha.1, < 40.7.0; version=>= 41.0.0-alpha.1, < 41.0.0-beta.8

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5Red Hat SADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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