Mafintosh's protocol-buffers-schema is vulnerable to prototype pollution

{
  "id": "88d680bfe5961a427467a0eae7b78650da5ebc8986f5245b3486c6f57c712489",
  "url": "https://osv.dev/vulnerability/CVE-2026-5758",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Mafintosh's protocol-buffers-schema is vulnerable to prototype pollution",
    "summary": "JavaScript is vulnerable to prototype pollution in Mafintosh's protocol-buffers-schema Version 3.6.0, where an attacker may alter the application logic, bypass security checks, cause a DoS or achieve remote code execution.",
    "evidence": "osv:CVE-2026-5758",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-5758",
      "aliases": [
        "CVE-2026-5758",
        "GHSA-j452-xhg8-qg39"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mafintosh/protocol-buffers-schema",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b901de0774f80ec00f3b07307a2cf5e13526800c"
                },
                {
                  "fixed": "46c34bd3199aa1e32374a1af59d02413b9ea197a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.6.0"
                      },
                      {
                        "fixed": "3.6.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v3.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5758.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.348342603Z",
      "provider": "osv",
      "references": [
        "https://morielharush.github.io/2026/04/12/cve-2026-5758-protocol-buffers-schema-prototype-pollution/",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5758.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-5758",
        "https://github.com/mafintosh/protocol-buffers-schema/pull/70"
      ],
      "provider_metadata": {
        "cna_assigner": "certcc",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5758.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-5758",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493870,
  "published_at": "2026-04-15T17:20:13.551+00:00"
}