{"id":"CVE-2026-70603","aliases":["GHSA-5c9j-mhmv-5xgx"],"url":"https://o3.security/vulnerability/CVE-2026-70603","summary":"Electron: shell.openPath path validation bypass via embedded null byte","details":"### Impact\n`shell.openPath()` did not reject paths containing embedded null bytes. Apps that perform string-only validation of file paths (for example, checking the file extension) before passing them to `shell.openPath()` could be bypassed, allowing an attacker-controlled path to open a different file than the one that passed validation.\n\nApps are only affected if they pass paths derived from untrusted input to `shell.openPath()` and rely on string-based validation without a filesystem check. Node's `fs` APIs already reject paths containing null bytes, so apps that call `fs.existsSync()`, `fs.stat()`, or similar before `shell.openPath()` are not affected. Apps that do not call `shell.openPath()` with untrusted input are not affected.\n\n### Workarounds\nReject any path containing a null byte before passing it to `shell.openPath()`:\n```js\nif (filePath.includes('\\0')) throw new Error('invalid path');\n```\n\n### Fixed Versions\n* `42.0.0-beta.1`\n* `41.1.1`\n* `40.9.0`\n* `39.8.6`\n\n### For more information\nIf you have any questions or comments about this advisory, email us at [security@electronjs.org](mailto:security@electronjs.org)","published":"2026-08-05T15:56:50.574Z","modified":"2026-10-28T02:31:06.617258349Z","cvss":{"score":6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N"},"epss":{"score":0.001,"percentile":0.00991,"asOf":"2026-08-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"electron","fixedVersion":"42.0.0-beta.1"},{"ecosystem":"npm","name":"electron","fixedVersion":"41.1.1"},{"ecosystem":"npm","name":"electron","fixedVersion":"40.9.0"},{"ecosystem":"npm","name":"electron","fixedVersion":"39.8.6"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70603.json"},{"type":"ADVISORY","url":"https://github.com/electron/electron/security/advisories/GHSA-5c9j-mhmv-5xgx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70603"},{"type":"PACKAGE","url":"https://github.com/electron/electron"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:31:06.617258349Z"}}