High

vm2 before 3.11.7 Denylist Bypass via fs/promises

Type: advisorySources: OSV

vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: ['*', '-fs', '-child_process'] }), negative entries are matched by exact module name in lib/builtin.js, so -fs removes only the builtin named fs and does not remove builtin subpaths such as fs/promises. Sandboxed code can therefore call require('fs/promises') or require('node:fs/promises') and reach the promise-based filesystem API despite fs being denied; node: prefix handling is likewise inconsistent (a -node:fs/promises entry does not block require('fs/promises')). Host file creation and writing were confirmed via fsp.writeFile(), and other fs/promises operations (cp, mkdir, rename, rm, rmdir, truncate, read operations, etc.) are also reachable. This issue is fixed in vm2 3.11.7.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-92958
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 02:48 UTC · Revision 1

Source evidence

vm2 before 3.11.7 Denylist Bypass via fs/promises

core-osv · Original source

Published 17 Sept 2026, 13:46 UTC

osv:CVE-2026-92958

Complete source record

{
  "id": "a47fd8b14ce49d999e58154e09b0548fd40e44c70e1ad58680a35fbd0da34988",
  "url": "https://osv.dev/vulnerability/CVE-2026-92958",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vm2 before 3.11.7 Denylist Bypass via fs/promises",
    "summary": "vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: ['*', '-fs', '-child_process'] }), negative entries are matched by exact module name in lib/builtin.js, so -fs removes only the builtin named fs and does not remove builtin subpaths such as fs/promises. Sandboxed code can therefore call require('fs/promises') or require('node:fs/promises') and reach the promise-based filesystem API despite fs being denied; node: prefix handling is likewise inconsistent (a -node:fs/promises entry does not block require('fs/promises')). Host file creation and writing were confirmed via fsp.writeFile(), and other fs/promises operations (cp, mkdir, rename, rm, rmdir, truncate, read operations, etc.) are also reachable. This issue is fixed in vm2 3.11.7.",
    "evidence": "osv:CVE-2026-92958",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-92958",
      "aliases": [
        "CVE-2026-92958",
        "GHSA-6rh5-qq4q-97xh"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/patriksimek/vm2",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0c5b63a228c0af88d4a0d364ab0b90df278d710e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.11.7"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "2"
                      },
                      {
                        "last_affected": "3.11.6"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.11.6",
            "v3.11.5",
            "v3.11.4",
            "v3.11.3",
            "v3.11.2",
            "v3.11.1",
            "v3.11.0",
            "v3.10.5",
            "v3.10.4",
            "v3.10.3",
            "v3.10.2",
            "v3.10.1",
            "v3.10.0",
            "3.9.19",
            "3.9.18",
            "3.9.17",
            "3.9.16",
            "3.9.15",
            "3.9.14",
            "3.9.13",
            "3.9.12",
            "3.9.11",
            "3.9.10",
            "3.9.9",
            "3.9.8",
            "3.9.7",
            "3.9.6",
            "3.9.5",
            "3.9.4",
            "3.9.3",
            "v3.9.2",
            "v3.9.1",
            "v3.9.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92958.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.349255089Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92958.json",
        "https://github.com/patriksimek/vm2/security/advisories/GHSA-6rh5-qq4q-97xh",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-92958",
        "https://www.vulncheck.com/advisories/vm2-before-3.11.7-denylist-bypass-via-fs-promises"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-269"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92958.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-92958",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 492015,
  "published_at": "2026-09-17T13:46:15.549+00:00"
}