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

Quick assessment

Affected
electron electron
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

electron是Electron团队开源的一个用户编写跨平台桌面应用的 JavaScript 框架。该框架基于 nodejs 和 Chromium 可以使用HTML,CSS实现跨平台桌面应用的编写。 Electron 42.3.1版本至42.3.3之前版本存在缓冲区错误漏洞，该漏洞源于Buffer执行不正确的字节长度计算，导致堆缓冲区下溢/溢出，可能导致应用崩溃或意外截断/分配。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
electron electron >= 42.3.1, < 42.3.3 affected
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I. Basic Information for CVE-2026-54257

Vulnerability Information
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Vulnerability Title
Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Electron 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
electron是Electron团队开源的一个用户编写跨平台桌面应用的 JavaScript 框架。该框架基于 nodejs 和 Chromium 可以使用HTML,CSS实现跨平台桌面应用的编写。 Electron 42.3.1版本至42.3.3之前版本存在缓冲区错误漏洞，该漏洞源于Buffer执行不正确的字节长度计算，导致堆缓冲区下溢/溢出，可能导致应用崩溃或意外截断/分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
electron electron >= 42.3.1, < 42.3.3 -

II. Public POCs for CVE-2026-54257

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III. Intelligence Information for CVE-2026-54257

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Vendor Advisories for CVE-2026-54257 (1)

IV. Related Vulnerabilities

Same product: electron
Same vendor: electron
Same weakness: CWE-120

V. Comments for CVE-2026-54257

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