`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"`.
CVSS 3.1CRITICAL 9.1·Network·Low privileges·No interaction·EPSS 0.00403·Published 2026-08-07·Fixed in 0.9.1CWE-1321