CVE-2026-48170
CriticalCVSS 9.1Summary
scim-patch, a library for SCIM patch operations, prior to version 0.9.1 is vulnerable to prototype pollution when applying a SCIM PATCH operation whose 'value' object contains a key like '__proto__.someProp'. After such a patch, Object.prototype.someProp is set process-wide, affecting every plain object in the Node process.
Risk Assessment
Services using scim-patch on attacker-controlled data can be exploited for prototype pollution, potentially leading to unauthorized access or other attacks.
Recommendation
Upgrade scim-patch to version 0.9.1 or later. Alternatively, freeze prototypes (Object.freeze(Object.prototype) etc.) at process startup.
Original NVD description (English source)
`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.