Bug 2543491 (CVE-2026-102677)

Summary: CVE-2026-102677 electron: Electron: Privilege escalation via sandboxed preload code cache poisoning
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: cdrage, rushinde
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Electron. The cache mechanism for sandboxed preload scripts fails to verify that cached entries match the requested script. In applications that load untrusted web content, an attacker with a compromised renderer process can write malicious data into the cache to be reused on subsequent loads. This allows the attacker to achieve privilege escalation and execute arbitrary code within the higher-privileged preload execution context.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-29 18:37:03 UTC 
Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. From 42.3.3 until 42.10.0, 43.5.0, and 44.0.0-beta.6, Electron's sandboxed preload code cache did not verify that a cached entry matched the preload it was served for. A compromised renderer could write attacker-controlled cache data and cause Electron to reuse it for a later load, executing the renderer's code in the more privileged preload context. The issue affects applications that load untrusted content. This issue is fixed in versions 42.10.0, 43.5.0, and 44.0.0-beta.6.