CVE Intelligence
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CVE-2026-54257: Electron Buffer heap overflow from byte length miscalculation

Electron, a framework for cross-platform desktop applications, has a critical flaw in its Buffer component where byte lengths are calculated incorrectly, causing heap buffer underflows or overflows. The record states the issue affects versions from 42.3.1 until 42.3.3 and is fixed in 42.3.3. The sources consulted show no confirmed active exploitation.

Published Oct 13, 2026 · Updated Oct 13, 2026 · Ler em português

Overview

Electron is a framework for building cross-platform desktop applications with JavaScript, HTML and CSS. According to the GitHub Security Advisory, the Buffer component calculates byte lengths incorrectly, which can cause heap buffer underflows or overflows. The NVD record classifies the weakness as CWE-120.

Impact

  • Most affected applications are expected to crash.
  • Some applications may make incorrect buffer allocations in the Node.js Buffer API, leading to unexpected truncation or allocation.
  • The record assigns a critical CVSS 4.0 base score of 9.3 with network attack vector, low complexity, no privileges and no user interaction required.

Affected products and versions

  • Product: Electron.
  • Range stated in the record: from 42.3.1 until 42.3.3.
  • Fixed in 42.3.3.
  • The record contains no structured affected or fixed entries, so the exact boundary of the range is not specified.

Exploitation status

The CISA KEV field in the record is false, so this CVE is not listed in KEV. No confirmed active exploitation appears in the sources consulted.

Remediation and mitigation

  • Upgrade Electron-based applications to version 42.3.3 or later, following the GitHub Security Advisory.
  • Rebuild and redistribute packaged applications, since each bundled Electron runtime carries its own version.
  • Prioritize internet-facing and high-privilege applications because of the critical score.

Detection guidance

  • Inventory Electron versions across your application estate, including runtimes bundled inside packaged applications.
  • Monitor for unexpected crashes in Electron applications. Crashes may indicate this issue, but they have many other causes.
  • Review application logs for abnormal Buffer-related errors.

Limitations of the available information

  • The record does not provide a structured list of affected products beyond Electron, an exact range boundary, an EPSS score or SSVC data.
  • No exploitation evidence beyond the KEV flag is available in the record.
  • The analysis is based on the record content and the sources listed, not on a full review of the advisory.

Frequently asked questions

Is CVE-2026-54257 known to be actively exploited?

The record shows the CISA KEV flag as false, so it is not listed in KEV. No confirmed active exploitation appears in the sources consulted.

Which Electron version fixes this issue?

According to the GitHub Security Advisory referenced in the record, the issue is fixed in version 42.3.3. Applications should be upgraded to that version or later.

This analysis was drafted with AI assistance from verified source data and automatically checked against it.