{"id":"CVE-2026-54257","aliases":["GHSA-q6m5-f73j-m9mc"],"url":"https://o3.security/vulnerability/CVE-2026-54257","summary":"Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow","details":"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.","published":"2026-06-23T17:08:31.786Z","modified":"2026-08-12T03:51:45.569493240Z","cvss":null,"epss":{"score":0.00253,"percentile":0.16683,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"electron","fixedVersion":"42.3.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54257.json"},{"type":"ADVISORY","url":"https://github.com/electron/electron/security/advisories/GHSA-q6m5-f73j-m9mc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54257"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:45.569493240Z"}}