Summary
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 [email protected]
Impact
Most apps will crash and some may perform incorrect buffer allocations in the Node.js Buffer API resulting in unexpected truncation or allocation.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2026-54257? CVE-2026-54257 is a critical-severity security vulnerability in electron (npm), affecting versions >= 42.3.1, < 42.3.3. It is fixed in 42.3.3.
- Which versions of electron are affected by CVE-2026-54257? electron (npm) versions >= 42.3.1, < 42.3.3 is affected.
- Is there a fix for CVE-2026-54257? Yes. CVE-2026-54257 is fixed in 42.3.3. Upgrade to this version or later.
- Is CVE-2026-54257 exploitable, and should I be worried? Whether CVE-2026-54257 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-54257 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-54257? Upgrade
electronto 42.3.3 or later.