High [CVE-2026-54257] Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow
This high-severity Red Hat Linux advisory covers CVE-2026-54257.
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Summary
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.
An attacker could exploit this flaw to cause an application crash or trigger incorrect buffer allocations in the Node.js Buffer API, leading to unexpected data truncation or memory corruption, potentially allowing for arbitrary code execution. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H).
Weakness: CWE-131. Red Hat lists Red Hat Build of Podman Desktop as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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