{
"id": "GHSA-j4fx-xxwh-2485",
"aliases": [
"CVE-2026-8657"
],
"details": "Versions of the package jsondiffpatch before 0.7.6 are vulnerable to Prototype Pollution via the jsondiffpatch.patch() and jsondiffpatch/formatters/jsonpatch.patch() APIs. An attacker can perform prototype pollution by supplying crafted delta or JSON Patch documents, as attacker-controlled property names and path segments are used to traverse and modify objects without restricting access to special properties like __proto__ or constructor.prototype, allowing modification of Object.prototype.",
"summary": " jsondiffpatch patch APIs are vulnerable to prototype pollution",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7.6"
}
]
}
],
"package": {
"name": "jsondiffpatch",
"ecosystem": "npm"
}
}
],
"modified": "2026-08-31T22:10:51Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:P"
}
],
"published": "2026-05-16T06:30:29Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8657",
"type": "ADVISORY"
},
{
"url": "https://github.com/benjamine/jsondiffpatch/commit/381c0125efab49f6f0dbc08317d01d55717672af",
"type": "WEB"
},
{
"url": "https://gist.github.com/yuki-matsuhashi/e570fb1579ae1f3190059b622b0473fb",
"type": "WEB"
},
{
"url": "https://github.com/benjamine/jsondiffpatch",
"type": "PACKAGE"
},
{
"url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/filters/nested.ts%23L107-L115",
"type": "WEB"
},
{
"url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/filters/nested.ts%23L82-L87",
"type": "WEB"
},
{
"url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/formatters/jsonpatch-apply.ts%23L146-L168",
"type": "WEB"
},
{
"url": "https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/formatters/jsonpatch-apply.ts%23L171-L199",
"type": "WEB"
},
{
"url": "https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-16732792",
"type": "WEB"
},
{
"url": "https://security.snyk.io/vuln/SNYK-JS-JSONDIFFPATCH-16322990",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-1321"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2026-05-16T06:16:18Z",
"github_reviewed_at": "2026-08-31T22:10:51Z"
}
}