Vulnerability in electron (CVE-2026-54257)
Summary
Vulnerability in electron (CVE-2026-54257). Risk of unauthorized operations or information disclosure. Exploitable via Buffer. Mitigation: upgrade to 42.3.3 or later.
Original description
The description as published by the source.
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.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-54257 has been found in electron.
Attackers can target a specific entry point like Buffer over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade electron to 42.3.3 or later.
If unsure, ask your IT team or search "electron CVE-2026-54257" on the vendor's site.
CVE-2026-54257 (electron) — CWE-120
Attack surface: Buffer
Patched: 42.3.3 — apply immediately
Workaround: No workarounds.
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-120) exists in electron. Attackers reach the vulnerable code path via Buffer.
Check the vendor advisory for the affected versions of electron. Attack surface: Buffer.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 42.3.3.
Workaround: No workarounds.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'electron' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'electron' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
electronを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply temporary workaround mitigate
No workarounds.パッチが適用されるまでの応急処置として、No workarounds. を実施。回避策の副作用 (機能低下) を確認した上で。
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3Apply patch patch
Upgrade electron to 42.3.3ステージング環境で 42.3.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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4Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory github.com
- advisory nvd.nist.gov
- advisory github.com
- package github.com
- web github.com