---
cve: "CVE-2026-54257"
severity: "CRITICAL"
cvss: 9.3
epss: "25%"
vendor: "electron"
kev: false
exploited: false
published: "2026-06-23 18:18:07"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T19:19:58+02:00"
---

# CVE-2026-54257

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 22bbbc9f265d4b6f138f6dc7451891241037a780 (Commit)

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54257) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_