CVE-2026-54257
Critical
Description
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.
SeverityCritical
CVSS9.3
Exploit probability—
ProductElectron
PublishedJun 23, 2026
First seenJun 23, 2026
Weakness typeCWE-120CWE-120
How to fix
Update
- electron42.3.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| electronnpm | 42.3.1 ≤ v < 42.3.3 | 42.3.3 |
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