Vulnerabilidad · Publicado 07/08/2026 · Actualizado 08/08/2026
La biblioteca scim-patch versiones anteriores a 0.9.1 es vulnerable a contaminación de prototipos (prototype pollution) al procesar operaciones SCIM PATCH con valores malformados. Un atacante puede inyectar propiedades en Object.prototype a través de claves como "__proto__.someProp", comprometiendo todos los objetos planos en el proceso Node.js afectado. Esto afecta a servicios que procesan JSON controlado por el atacante, típicamente APIs de identidad y gestión de acceso.
`scim-patch`, a library to perform SCIM patch, prior to version 0.9.1 performs prototype pollution when applying a SCIM PATCH operation whose `value` object contains a key like `"__proto__.someProp"`. After one such patch, `Object.prototype.someProp` is set process-wide, affecting every plain object in the Node process. Any service that calls `scimPatch()` on attacker-controlled JSON (i.e. any SCIM endpoint accepting `PATCH` from an external IdP) is exploitable on a stock Node runtime. Version 0.9.1 contains a patch. A workaround is available. Calling `Object.freeze(Object.prototype)` (and the same on `Array.prototype`, `Function.prototype`) at process startup neutralizes this class of bug — assignment to a frozen prototype becomes a silent no-op in sloppy mode or a `TypeError` in strict mode. Node's `--frozen-intrinsics` flag does this for built-ins automatically.
Score: 9.1/10 — Severidad: CRITICAL — Estado NIST: Received
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L
CWE-1321
Publicado en NIST NVD.