Bug 2491877 (CVE-2026-54257)

Summary: CVE-2026-54257 electron: Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: cdrage, rhel-process-autobot, rushinde, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Electron, a framework for building cross-platform desktop applications. The Buffer implementation performs incorrect byte length calculations, resulting in a heap buffer underflow or overflow. 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.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2496010, 2496011    
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Description OSIDB Bzimport 2026-06-23 18:02:32 UTC 
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.