`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,
Exact source revision recorded 3 Nov 2026 09:59:13 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-54686
Published`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.
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Original publisher date fields
datePublished: Aug 7, 2026, 9:26:54 PM
dateUpdated: Aug 10, 2026, 2:06:00 PM
- Source published
- Aug 7, 2026, 9:26:54 PM (timezone not stated)
- Source modified
- Aug 10, 2026, 2:06:00 PM (timezone not stated)
- Observed here
- 3 Nov 2026 09:59:13 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
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EUVD CVSS 3.1 · 9.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L