{"id":"CVE-2026-48170","title":"`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\"`","summary":"`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,\n`Object.protot…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L","cwe":["CWE-1321"],"vendor":"scim-patch","product":"scim-patch","affected":["scim-patch <= 0.9.0"],"patched":["scim-patch 0.9.1"],"published":"2026-08-07","updated":"2026-09-18","sourceUpdated":"2026-09-18T20:09:01.757","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-48170","references":[{"url":"https://github.com/thomaspoignant/scim-patch/commit/260f9cd2ac5ceac3976978850bb47dcb391720f6","label":"security-advisories@github.com"},{"url":"https://github.com/thomaspoignant/scim-patch/security/advisories/GHSA-9m6g-wc8r-q59c","label":"security-advisories@github.com"},{"url":"https://github.com/thomaspoignant/scim-patch/security/advisories/GHSA-9m6g-wc8r-q59c","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-9m6g-wc8r-q59c"}],"tags":["nvd","ghsa","npm"],"epss":0.00307,"epssPercentile":0.23583,"ecosystem":"npm","ingestedAt":"2026-06-29T13:24:35.494Z","slug":"CVE-2026-48170","body":"## Overview\n\n`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,\n`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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-48170)\n\nAffected packages:\n\n- `scim-patch <= 0.9.0`\n\nPatched in:\n\n- `scim-patch 0.9.1`\n\nSource: https://github.com/advisories/GHSA-9m6g-wc8r-q59c","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}