{"schemaVersion":3,"id":"CVE-2026-34776","aliases":["GHSA-3c8v-cfp5-9885"],"status":"published","duplicateOf":null,"title":null,"description":"Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0, on macOS and Linux, apps that call app.requestSingleInstanceLock() were vulnerable to an out-of-bounds heap read when parsing a crafted second-instance message. Leaked memory could be delivered to the app's second-instance event handler. This issue is limited to processes running as the same user as the Electron app. Apps that do not call app.requestSingleInstanceLock() are not affected. Windows is not affected by this issue. This issue has been patched in versions 38.8.6, 39.8.1, 40.8.1, and 41.0.0.","dates":{"published":"2026-04-03T23:56:42.200Z","modified":"2026-04-06T15:31:46.052Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Npm","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:L","exploitability":2.6,"impact":7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.3,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00232,"percentile":0.13294,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":0.01299999999999999,"baselineDate":"2026-09-21T00:00:00.000Z","baselineScore":0.00219},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00232,"percentile":0.13294}],"last30":[{"date":"2026-09-21T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00219,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00232,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00232,"percentile":0.13294}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-125","name":"Out-of-bounds Read","description":"The product reads data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/125.html"}],"affected":[{"vendor":"electron","product":"electron","name":"electron","label":"electron","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 38.8.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 39.0.0-alpha.1, < 39.8.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 40.0.0-alpha.1, < 40.8.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 41.0.0-alpha.1, < 41.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 38.8.6 | ≥ 39.0.0-alpha.1, < 39.8.1 | ≥ 40.0.0-alpha.1, < 40.8.1 | ≥ 41.0.0-alpha.1, < 41.0.0","eol":null,"hubHref":"/vendor/electron/electron"},{"vendor":"electronjs","product":"electron","name":"electron","label":"electron","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 38.8.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 39.0.0, < 39.8.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 40.0.0, < 40.8.1","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:alpha1","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:alpha2","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:alpha3","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:alpha4","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:alpha5","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:alpha6","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta1","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta2","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta3","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta4","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta5","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta6","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta7","noFixRecorded":false,"fixedIn":null},{"text":"41.0.0:beta8","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 38.8.6 | ≥ 39.0.0, < 39.8.1 | ≥ 40.0.0, < 40.8.1 | 41.0.0:alpha1 | 41.0.0:alpha2 | 41.0.0:alpha3 | 41.0.0:alpha4 | 41.0.0:alpha5 | 41.0.0:alpha6 | 41.0.0:beta1 | 41.0.0:beta2 | 41.0.0:beta3 | 41.0.0:beta4 | 41.0.0:beta5 | 41.0.0:beta6 | 41.0.0:beta7 | 41.0.0:beta8","eol":{"isEol":true,"eolDate":"2026-08-24T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"41","label":"41","eolFrom":"2026-08-24T00:00:00.000Z","isLts":false,"isMaintained":false,"latestVersion":"41.10.7"},"product":{"name":"electron","label":"Electron","category":"framework"}},"hubHref":"/vendor/electronjs/electron"},{"vendor":"Npm","product":"electron","name":"electron","label":"electron","ecosystem":"Npm","cpePart":null,"purl":"pkg:npm/electron","purlType":"npm","versions":[{"text":"< 38.8.6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 39.0.0-alpha.1, < 39.8.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 40.0.0-alpha.1, < 40.8.1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 41.0.0-alpha.1, < 41.0.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 38.8.6 | ≥ 39.0.0-alpha.1, < 39.8.1 | ≥ 40.0.0-alpha.1, < 40.8.1 | ≥ 41.0.0-alpha.1, < 41.0.0","eol":null,"hubHref":null}],"affectedCount":3,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885","label":"github.com/electron/electron/security/advisories/GHSA-3c8v-cfp5-9885","hostname":"github.com","tags":["X Refsource CONFIRM","WEB","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34776","label":"nvd.nist.gov/vuln/detail/CVE-2026-34776","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://github.com/electron/electron","label":"github.com/electron/electron","hostname":"github.com","tags":["PACKAGE"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-04-03T23:56:42.200Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-06T15:31:46.052Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T18:46:19.634Z","stale":false,"partial":false}}