Tinypool: Prototype Pollution Gadget to RCE in run() options

{
  "id": "39493b2b4a38c4f6c76dfaee74fc33c86c5b27c45388950a1eb95534178198b8",
  "url": "https://osv.dev/vulnerability/CVE-2026-104849",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Tinypool: Prototype Pollution Gadget to RCE in run() options",
    "summary": "Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.2, Tinypool reads filename from a caller-supplied options object in pool.run(task, options) without requiring an own property, so a polluted Object.prototype.filename can replace the intended worker module. Applications are affected only when they pass their own second-argument options object to pool.run(); calls without that argument use the trusted default options object. An attacker who can first pollute the prototype can cause the worker pool to load attacker-selected JavaScript and can read or modify task data with the host process's privileges. This issue is fixed in version 2.1.2.",
    "evidence": "osv:CVE-2026-104849",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-104849",
      "aliases": [
        "CVE-2026-104849",
        "GHSA-85c8-ppgw-ccpr"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tinylibs/tinypool",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "5e18382a9aaa3344035905384b18a88a9da8c8bb"
                },
                {
                  "fixed": "f41411a3e23324c674f35a19a3240f7a7c40ffbf"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.1.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "f41411a3e23324c674f35a19a3240f7a7c40ffbf"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5e18382a9aaa3344035905384b18a88a9da8c8bb"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.1.2"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.1",
            "v2.1.0",
            "v2.0.0",
            "v1.1.1",
            "v1.1.0",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.9.0",
            "v0.8.4",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.0",
            "v0.6.0",
            "v0.5.0",
            "v0.4.0",
            "v0.3.1",
            "v0.3.0",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "v0.1.3",
            "v0.1.2",
            "v0.1.1",
            "v0.1.0",
            "v0.0.8",
            "v0.0.7",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2",
            "v0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104849.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.506447914Z",
      "provider": "osv",
      "references": [
        "https://github.com/tinylibs/tinypool/releases/tag/v2.1.2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104849.json",
        "https://github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104849",
        "https://github.com/tinylibs/tinypool/commit/f41411a3e23324c674f35a19a3240f7a7c40ffbf",
        "https://github.com/tinylibs/tinypool/pull/135"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1321",
          "CWE-94"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104849.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104849",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504749,
  "published_at": "2026-10-02T16:17:28.062+00:00"
}