CVE-2026-54257: Electron

Critical severity, CVSS 9.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.1 until 42.3.3, Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow. Most apps will crash and some may perform incorrect buffer allocations in the Node.js Buffer API resulting in unexpected truncation or allocation. This vulnerability is fixed in 42.3.3.

Affected products

• Electron Electron: from 42.3.1, before 42.3.3 (fixed in 42.3.3)

Published 2026-06-23. Last modified 2026-06-25.