{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93603","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-18T11:00:32.756Z","datePublished":"2026-09-18T13:20:12.955Z","dateUpdated":"2026-09-22T14:25:29.801Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-18T13:20:12.955Z"},"datePublic":"2026-09-03T00:00:00.000Z","title":"vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function","descriptions":[{"lang":"en","value":"vm2 through 3.12.0 (fixed in 3.12.1) does not correctly handle a nullish `this` receiver in the apply trap of its bridge (lib/bridge.js): when sandboxed code calls a host-provided non-strict (sloppy-mode) function without a receiver — e.g. `fn()`, a detached method, `fn.call()`, `fn.apply(undefined)`, `Reflect.apply(fn, undefined, [])`, or `fn.bind()()` — the undefined receiver is passed straight through to the host call, and V8 substitutes the host realm's global object for `this`. vm2 then wraps and returns that object to the sandbox, giving sandboxed script a live proxy of the host global. This allows a complete sandbox escape: untrusted script can reach `process` and execute arbitrary code/commands on the host (for example via `process.getBuiltinModule('child_process').execSync`). Exploitation requires that the embedding application expose at least one non-strict host function to the sandbox; strict-mode and ES module host functions are not affected."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Control of Generation of Code ('Code Injection')","cweId":"CWE-94","type":"CWE"}]}],"affected":[{"vendor":"patriksimek","product":"vm2","defaultStatus":"unaffected","packageURL":"pkg:npm/vm2","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"3.12.1"},{"version":"3.12.1","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:vm2_project:vm2:*:*:*:*:*:node.js:*:*","versionEndExcluding":"3.12.1"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL"}}],"references":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-j89j-5m6r-cr2q","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-j89j-5m6r-cr2q)"},{"name":"VulnCheck Advisory: vm2 before 3.12.1 Sandbox Escape RCE via Non-Strict Host Function","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/vm2-before-3.12.1-sandbox-escape-rce-via-non-strict-host-function"}],"credits":[{"lang":"en","value":"RajChowdhury240","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"references":[{"url":"https://github.com/patriksimek/vm2/security/advisories/GHSA-j89j-5m6r-cr2q","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-22T14:25:04.925932Z","id":"CVE-2026-93603","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-22T14:25:29.801Z"}}]}}