CVE-2026-54257
criticalpriority · track · 0EPSS 0.004 · 37 %ileEUUSEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.3
ssvc
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weaknesses
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affected products (2)
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advisories (1)
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- GHSA-q6m5-f73j-m9mcElectron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow2026-06-15ghsa · osvUS
### Impact Most apps will crash and some may perform incorrect buffer allocations in the Node.js `Buffer` API resulting in unexpected truncation or allocation. ### Workarounds No workarounds. Do not use these impacted Electron releases ### Fixed Versions * `42.3.3` ### For more information If you have any questions or comments about this advisory, email us at [security@electronjs.org](mailto:security@electronjs.org)
also known as (3)
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sources
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references (3)
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