vm2 before 3.12.2 Host Process Termination via Construct Trap

vm2 before 3.12.2 does not apply host-side Promise rejection handling in the sandbox-to-host construct trap. In BaseHandler, the apply trap calls markHostPromiseHandled() on the returned value, but the adjacent construct path returns the result of Reflect.construct without the same sanitization. If an embedder exposes a constructable host function whose constructor returns a native rejected Promise, an untrusted script executed via VM.run can invoke it with `new` and ignore the result; the rejected host Promise crosses the bridge unhandled and, under Node's strict unhandled-rejection policy, is promoted to an uncaught exception that terminates the host process.

Problem type

Uncaught Exception

Affected products

patriksimek

vm2

< 3.12.2 - AFFECTED

3.12.2 - UNAFFECTED

References

GitHub Security Advisory (GHSA-2v2p-6j97-cjg9)

https://github.com/patriksimek/vm2/security/advisories/GHSA-2v2p-6j97-cjg9

vendor-advisory

VulnCheck Advisory: vm2 before 3.12.2 Host Process Termination via Construct Trap

https://www.vulncheck.com/advisories/vm2-before-3.12.2-host-process-termination-via-construct-trap

third-party-advisory

GitHub Security Advisories

GHSA-7rr2-8fr3-fjqx

vm2 before 3.12.2 does not apply host-side Promise rejection handling in the sandbox-to-host...

https://github.com/advisories/GHSA-7rr2-8fr3-fjqx

vm2 before 3.12.2 does not apply host-side Promise rejection handling in the sandbox-to-host construct trap. In BaseHandler, the apply trap calls markHostPromiseHandled() on the returned value, but the adjacent construct path returns the result of Reflect.construct without the same sanitization. If an embedder exposes a constructable host function whose constructor returns a native rejected Promise, an untrusted script executed via VM.run can invoke it with new and ignore the result; the rejected host Promise crosses the bridge unhandled and, under Node's strict unhandled-rejection policy, is promoted to an uncaught exception that terminates the host process.

github.com

https://github.com/patriksimek/vm2/security/advisories/GHSA-2v2p-6j97-cjg9

nvd.nist.gov

https://nvd.nist.gov/vuln/detail/CVE-2026-100722

vulncheck.com

https://www.vulncheck.com/advisories/vm2-before-3.12.2-host-process-termination-via-construct-trap

github.com

https://github.com/advisories/GHSA-7rr2-8fr3-fjqx

JSON source

https://cveawg.mitre.org/api/cve/CVE-2026-100722

Click to expand

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-100722",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-09-27T01:28:29.295Z",
    "dateReserved": "2026-09-26T02:40:56.226Z",
    "datePublished": "2026-09-27T01:28:29.295Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-09-27T01:28:29.295Z"
      },
      "datePublic": "2026-09-08T00:00:00.000Z",
      "title": "vm2 before 3.12.2 Host Process Termination via Construct Trap",
      "descriptions": [
        {
          "lang": "en",
          "value": "vm2 before 3.12.2 does not apply host-side Promise rejection handling in the sandbox-to-host construct trap. In BaseHandler, the apply trap calls markHostPromiseHandled() on the returned value, but the adjacent construct path returns the result of Reflect.construct without the same sanitization. If an embedder exposes a constructable host function whose constructor returns a native rejected Promise, an untrusted script executed via VM.run can invoke it with `new` and ignore the result; the rejected host Promise crosses the bridge unhandled and, under Node's strict unhandled-rejection policy, is promoted to an uncaught exception that terminates the host process."
        }
      ],
      "affected": [
        {
          "vendor": "patriksimek",
          "product": "vm2",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.12.2"
            },
            {
              "version": "3.12.2",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Uncaught Exception",
              "cweId": "CWE-248",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/patriksimek/vm2/security/advisories/GHSA-2v2p-6j97-cjg9",
          "name": "GitHub Security Advisory (GHSA-2v2p-6j97-cjg9)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/vm2-before-3.12.2-host-process-termination-via-construct-trap",
          "name": "VulnCheck Advisory: vm2 before 3.12.2 Host Process Termination via Construct Trap",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "NONE",
            "userInteraction": "NONE",
            "scope": "CHANGED",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "availabilityImpact": "HIGH",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "rexpository",
          "type": "reporter"
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    }
  }
}