Improper input validation in Electron
CVE-2026-70603
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. Prior to 39.8.6, 40.9.0, 41.1.1, and 42.0.0-beta.1, 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. Apps are only affected if they pass paths derived from untrusted input to shell.openPath() and rely on string-based validation without a filesystem check. This issue is fixed in versions 39.8.6, 40.9.0, 41.1.1, and 42.0.0-beta.1.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.001 (2.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: -0.000
Affected products
- Electron — versions < 39.8.6, >= 40.0.0-alpha.1, < 40.9.0, >= 41.0.0-alpha.1, < 41.1.1
- Electronjs Electron — versions 42.0.0
Weakness classification (CWE)
References
- github.com/electron/electron/security/advisories/GHSA-5c9j-mhmv-5xgx (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-70603?
- CVE-2026-70603 is a medium-severity vulnerability in Electron, classified under Improper Input Validation. CVSS score: 6.0/10. Published 2026-08-05.
- How severe is CVE-2026-70603?
- Medium severity. CVSS v3 base score is 6.0 out of 10.