CVE-2026-104849 (GCVE-0-2026-104849)

Vulnerability from cvelistv5 – Published: 2026-10-02 16:17 – Updated: 2026-10-02 16:17
VLAI
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.
Severity
9.5 (Critical)
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
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Vendor Product Version
tinylibs tinypool Affected: < 2.1.2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "tinypool",
          "vendor": "tinylibs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s privileges. This issue is fixed in version 2.1.2."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.5,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
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      "problemTypes": [
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              "type": "CWE"
            }
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        {
          "descriptions": [
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              "cweId": "CWE-1321",
              "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-02T16:17:28.062Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr"
        },
        {
          "name": "https://github.com/tinylibs/tinypool/pull/135",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tinylibs/tinypool/pull/135"
        },
        {
          "name": "https://github.com/tinylibs/tinypool/commit/f41411a3e23324c674f35a19a3240f7a7c40ffbf",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tinylibs/tinypool/commit/f41411a3e23324c674f35a19a3240f7a7c40ffbf"
        },
        {
          "name": "https://github.com/tinylibs/tinypool/releases/tag/v2.1.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/tinylibs/tinypool/releases/tag/v2.1.2"
        }
      ],
      "source": {
        "advisory": "GHSA-85c8-ppgw-ccpr",
        "discovery": "UNKNOWN"
      },
      "title": "Tinypool: Prototype Pollution Gadget to RCE in run() options"
    }
  },
  "cveMetadata": {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-104849",
    "datePublished": "2026-10-02T16:17:28.062Z",
    "dateReserved": "2026-10-02T14:38:43.244Z",
    "dateUpdated": "2026-10-02T16:17:28.062Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-10-03",
      "epss": "0.0039",
      "percentile": "0.30714"
    }
  }
}



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