{"id":"GHSA-j4fx-xxwh-2485","summary":" jsondiffpatch patch APIs are vulnerable to prototype pollution","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.","aliases":["CVE-2026-8657"],"modified":"2026-09-10T03:51:05.988087881Z","published":"2026-05-16T06:30:29Z","database_specific":{"nvd_published_at":"2026-05-16T06:16:18Z","cwe_ids":["CWE-1321"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-08-31T22:10:51Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8657"},{"type":"WEB","url":"https://github.com/benjamine/jsondiffpatch/commit/381c0125efab49f6f0dbc08317d01d55717672af"},{"type":"WEB","url":"https://gist.github.com/yuki-matsuhashi/e570fb1579ae1f3190059b622b0473fb"},{"type":"PACKAGE","url":"https://github.com/benjamine/jsondiffpatch"},{"type":"WEB","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"}],"affected":[{"package":{"name":"jsondiffpatch","ecosystem":"npm","purl":"pkg:npm/jsondiffpatch"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.7.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-j4fx-xxwh-2485/GHSA-j4fx-xxwh-2485.json"}}],"schema_version":"1.9.0","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"}]}