CVE-2026-93606

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{"bugzilla": {"description": "vm2: vm2 before 3.12.1 Sandbox Escape via Promise Symbol.species", "id": "2538416", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2538416"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-653", "details": ["vm2 (npm) versions 3.12.0 and earlier contain a sandbox escape in `VM` and `NodeVM`. When an embedder exposes a host API that returns a host-realm Promise, the bridge's rejection sanitizer (hostPromiseSanitizeReject / makeSanitizedPromiseCallback / normalizeHostPromiseCallbacks in lib/bridge.js) only wraps `then`/`catch` rejection slots that hold a function, and the sandbox-side `Symbol.species`/`.then` neutralization is installed only on the sandbox intrinsic `Promise.prototype`, so it never applies to a host Promise. Code running inside the sandbox can overwrite `p.constructor[Symbol.species]` on the host Promise and then call `p.then()` with no `onRejected` handler; V8 substitutes its internal Thrower, which re-throws the raw host rejection value into a resolve/reject closure captured by the attacker. This delivers an unsanitized, fully functional bridge proxy of the host object to sandboxed code, bypassing handleException and hostPromiseSanitizeReject. If the rejection value is host-pivotable (for example a host `process` object), this results in arbitrary code execution on the host. Fixed in 3.12.1.", "A flaw was found in vm2. An attacker running untrusted code within the sandbox can bypass isolation controls to achieve arbitrary code execution on the host system. This issue is caused by improper sanitization of host Promise objects, which allows sandboxed scripts to manipulate Promise constructor properties and obtain direct references to sensitive host-level objects. Consequently, an attacker can break out of the restricted sandbox environment and fully compromise the host."], "mitigation": {"lang": "en:us", "value": "Until the fix is applied, do not expose host functions that return host-realm Promise objects to VM/NodeVM. Return only serialized primitives, or keep host work fully outside the sandbox."}, "name": "CVE-2026-93606", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Affected", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/bootc-automation-portal-rhel9", "product_name": "Self-service automation portal 2"}], "public_date": "2026-09-18T13:20:15Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93606\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93606\nhttps://github.com/patriksimek/vm2/security/advisories/GHSA-6454-5x88-m6jw\nhttps://www.vulncheck.com/advisories/vm2-before-3.12.1-sandbox-escape-via-promise-symbol-species"], "statement": "This vulnerability is rated with Critical severity because it permits an attacker executing code within a sandboxed environment to bypass isolation boundaries and achieve full arbitrary code execution within the host process without requiring privileges or user interaction. In Red Hat environments where services evaluate user-supplied JavaScript, an untrusted actor can escape sandbox containment and gain control over the underlying application process. The total breakdown of containment controls and the potential for complete host-level compromise justify the Critical impact rating.", "threat_severity": "Critical"}

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