CVE-2026-54257
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedElectron 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceElectron versions 42.3.1 through 42.3.3 contain a heap buffer underflow/overflow vulnerability in the Buffer implementation due to incorrect byte length calculations. This flaw in the Node.js Buffer API can cause application crashes, incorrect buffer allocations, unexpected truncation, or memory corruption.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- Authentication
- X
- User interaction
- None
- Scope
- X
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Determine your Electron versionRun `electron --version` from your terminal, or in your running Electron app execute `console.log(process.versions.electron)`Affected if The version is 42.3.1, 42.3.2, or 42.3.3 exactly
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Confirm Node.js runtime versionRun `node --version` or in the app execute `console.log(process.versions.node)`Affected if Node.js version is bundled with the affected Electron versions (combined check helps confirm the build)
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Identify Buffer API usageSearch your codebase for Buffer constructor calls such as `new Buffer()`, `Buffer.alloc()`, `Buffer.from()`, or any buffer manipulation methodsAffected if Your application uses Node.js Buffer API operations and runs the affected Electron version
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Check for external input-driven buffer operationsReview code paths where external input (file contents, network data, user input) flows into Buffer creation or manipulation functionsAffected if External data influences buffer size or content and the affected Electron version is in use
You are affected if your installed Electron version is exactly 42.3.1, 42.3.2, or 42.3.3 and your application uses the Node.js Buffer API with data that could trigger incorrect length calculations.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade Electron to version 42.3.3 or later to resolve the Buffer byte length calculation vulnerability. Test all Buffer API usage thoroughly after the update.
Electron 42.3.3 or later
- 1. Identify the current Electron version in your application by checking package.json or running `npm list electron`
- 2. If your Electron version is 42.3.1 or 42.3.2, update your package.json to specify Electron version 42.3.3 or later
- 3. Run `npm install` or `npm update` to install the fixed version
- 4. Rebuild and test your application thoroughly to ensure compatibility with the update
- 5. Redeploy the application to all environments
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,328.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-54257 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-54257 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data