CVE-2026-54257: Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow

Critical severity · published Jun 23, 2026

CVE-2026-54257

Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow

9.3

CVSS

0.4%

EPSS

On KEV

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.

Exploitation

Is it being used?

Exploit prediction (EPSS)0.4% · higher than 37% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

electron · electron

>= 42.3.1, < 42.3.3 · source: vendor

Affected product

electron