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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-q6m5-f73j-m9mc Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow
Fixes

Solution

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Workaround

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History

Tue, 23 Jun 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 23 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
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.
Title Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow
Weaknesses CWE-120
References
Metrics cvssV4_0

{'score': 9.3, 'vector': '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-06-23T17:47:47.594Z

Reserved: 2026-06-12T17:13:32.278Z

Link: CVE-2026-54257

cve-icon Vulnrichment

Updated: 2026-06-23T17:47:41.615Z

cve-icon NVD

No data.

cve-icon Redhat

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cve-icon OpenCVE Enrichment

No data.

Weaknesses