CVE-2026-23830

{"id": "CVE-2026-23830", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23830", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-01-28T15:09:12.332920Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 10.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "nyariv", "product": "SandboxJS", "versions": [{"status": "affected", "version": "< 0.8.26"}]}]}], "published": "2026-01-28T00:15:50.170", "references": [{"url": "https://github.com/nyariv/SandboxJS/commit/345aee6566e47979dee5c337b925b141e7f78ccd", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/nyariv/SandboxJS/security/advisories/GHSA-wxhw-j4hc-fmq6", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-693"}, {"lang": "en", "value": "CWE-913"}]}], "descriptions": [{"lang": "en", "value": "SandboxJS is a JavaScript sandboxing library. Versions prior to 0.8.26 have a sandbox escape vulnerability due to `AsyncFunction` not being isolated in `SandboxFunction`. The library attempts to sandbox code execution by replacing the global `Function` constructor with a safe, sandboxed version (`SandboxFunction`). This is handled in `utils.ts` by mapping `Function` to `sandboxFunction` within a map used for lookups. However, before version 0.8.26, the library did not include mappings for `AsyncFunction`, `GeneratorFunction`, and `AsyncGeneratorFunction`. These constructors are not global properties but can be accessed via the `.constructor` property of an instance (e.g., `(async () => {}).constructor`). In `executor.ts`, property access is handled. When code running inside the sandbox accesses `.constructor` on an async function (which the sandbox allows creating), the `executor` retrieves the property value. Since `AsyncFunction` was not in the safe-replacement map, the `executor` returns the actual native host `AsyncFunction` constructor. Constructors for functions in JavaScript (like `Function`, `AsyncFunction`) create functions that execute in the global scope. By obtaining the host `AsyncFunction` constructor, an attacker can create a new async function that executes entirely outside the sandbox context, bypassing all restrictions and gaining full access to the host environment (Remote Code Execution). Version 0.8.26 patches this vulnerability."}, {"lang": "es", "value": "SandboxJS es una librer\u00eda de sandboxing de JavaScript. Las versiones anteriores a la 0.8.26 tienen una vulnerabilidad de escape de sandbox debido a que `AsyncFunction` no est\u00e1 aislada en `SandboxFunction`. La librer\u00eda intenta aplicar un sandbox a la ejecuci\u00f3n de c\u00f3digo reemplazando el constructor global `Function` con una versi\u00f3n segura y con sandbox (`SandboxFunction`). Esto se maneja en `utils.ts` mapeando `Function` a `sandboxFunction` dentro de un mapa utilizado para b\u00fasquedas. Sin embargo, antes de la versi\u00f3n 0.8.26, la librer\u00eda no inclu\u00eda mapeos para `AsyncFunction`, `GeneratorFunction` y `AsyncGeneratorFunction`. Estos constructores no son propiedades globales, pero se puede acceder a ellos a trav\u00e9s de la propiedad `.constructor` de una instancia (por ejemplo, `(async () =&gt; {}).constructor`). En `executor.ts`, se maneja el acceso a propiedades. Cuando el c\u00f3digo que se ejecuta dentro del sandbox accede a `.constructor` en una funci\u00f3n as\u00edncrona (que el sandbox permite crear), el `executor` recupera el valor de la propiedad. Dado que `AsyncFunction` no estaba en el mapa de reemplazo seguro, el `executor` devuelve el constructor `AsyncFunction` nativo real del host. Los constructores para funciones en JavaScript (como `Function`, `AsyncFunction`) crean funciones que se ejecutan en el \u00e1mbito global. Al obtener el constructor `AsyncFunction` del host, un atacante puede crear una nueva funci\u00f3n as\u00edncrona que se ejecuta completamente fuera del contexto del sandbox, eludiendo todas las restricciones y obteniendo acceso total al entorno del host (ejecuci\u00f3n remota de c\u00f3digo). La versi\u00f3n 0.8.26 corrige esta vulnerabilidad."}], "lastModified": "2026-06-17T10:22:10.250", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:nyariv:sandboxjs:*:*:*:*:*:node.js:*:*", "vulnerable": true, "matchCriteriaId": "39569A92-6C8F-4E00-8280-F8AA92EA4150", "versionEndExcluding": "0.8.26"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}