CVE-2026-54257

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

State: Published
Severity: 9.3 Critical
Published: Jun 23, 2026
Updated: Jun 23, 2026
Reserved: Jun 12, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Affected Products

Product	Versions
electronelectron	>= 42.3.1, < 42.3.3Affected

References

https://github.com/electron/electron/security/advisories/GHSA-q6m5-f73j-m9mc

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