Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow

{
  "id": "91cb5f6155c19d57328aa27daef0488b82e200b67d185abcef6ac131a6966c1b",
  "url": "https://osv.dev/vulnerability/CVE-2026-54257",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Electron: Buffer performs incorrect byte length calculations resulting in heap buffer under/overflow",
    "summary": "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.",
    "evidence": "osv:CVE-2026-54257",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-54257",
      "aliases": [
        "CVE-2026-54257",
        "GHSA-q6m5-f73j-m9mc"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/electron/electron",
              "type": "GIT",
              "events": [
                {
                  "introduced": "297c6e3ee41697d9d4d3bc0c9d6243b8608d55e5"
                },
                {
                  "fixed": "22bbbc9f265d4b6f138f6dc7451891241037a780"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "42.3.1"
                      },
                      {
                        "fixed": "42.3.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "42.3.3"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v42.3.2",
            "v42.3.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54257.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.971326320Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54257.json",
        "https://github.com/electron/electron/security/advisories/GHSA-q6m5-f73j-m9mc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54257"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-120"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54257.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54257",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 500988,
  "published_at": "2026-06-23T17:08:31.786+00:00"
}