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NVD 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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-06-16 | 1 | Disclosure1 |
| 2026-06-23 | 1 | Disclosure1 |
| 2026-06-24 | 1 | Patch1 |
| 2026-07-15 | 1 | General1 |
CVE-2026-54257: Electron Buffer Byte Length Calculation Flaw - What It Means for Your Business and How to Respond https://hubs.li/Q04pD7Ct0
Post summary
This is an article announcing CVE‑2026‑54257, a flaw in Electron’s buffer byte length calculation, and outlining business impacts and response recommendations, but no details on PoC, exploit, active use, or patch.
🚨 CRITICAL - Electron Buffer byte-length miscalculation leading to heap buffer underflow/overflow (CVE-2026-54257) Electron’s Buffer implementation in the Node.js Buffer API performs incorrect byte-length calculations, resulting in unsafe memory operations in Electron 42.3.1–42.3.2. The root cause is an integer/length calculation error that can trigger heap buffer underflow/overflow and incorrect buffer allocation sizing. An attacker can exploit this via crafted inputs that influence buffer creation/encoding paths (e.g., untrusted data processed by a renderer or app logic), requiring only the ability to get the target app to handle malicious content. Real-world impact includes widespread application crashes (DoS) and, in worst cases, memory corruption scenarios that can enable code execution or data integrity issues due to unexpected truncation/allocation behavior. 👉 Affected: electron 42.3.1-42.3.2 | Upgrade to 42.3.3
Post summary
The tweet announces CVE‑2026‑54257, a critical Electron buffer under/overflow bug that can lead to crashes or code execution, and recommends upgrading to electron 42.3.3 for remediation.
CVE-2026-54257 Heap Buffer Under/Overflow in Electron 42.3.1 Through 42.3.2 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-54257
Post summary
A newly identified heap buffer under/overflow vulnerability (CVE-2026-54257) affecting Electron 42.3.1‑42.3.2 is disclosed with technical details but no PoC, exploit code, patches, or evidence of active exploitation.
🚨 Critical - Electron Heap Buffer Overflow (CVE-2026-54257) Incorrect byte length calculations in Electron's Node.js Buffer API cause heap under/overflow, leading to memory corruption or crash. The flaw requires no privileges or user interaction and affects only the two patch releases between 42.3.1 and 42.3.3 (CVSS 9.3). 👉 Affected: electron ≥ 42.3.1 < 42.3.3 | Upgrade to 42.3.3
Post summary
The tweet announces a critical heap buffer overflow in Electron (CVE-2026-54257) with a high CVSS score and advises users to upgrade to patch 42.3.3.