{"id":"CVE-2026-8657","aliases":["GHSA-j4fx-xxwh-2485"],"url":"https://o3.security/vulnerability/CVE-2026-8657","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.","published":"2026-05-16T05:00:09.867Z","modified":"2026-09-02T03:55:58.149475182Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"jsondiffpatch","fixedVersion":"0.7.6"}],"fix":{"url":"https://github.com/benjamine/jsondiffpatch/commit/381c0125efab49f6f0dbc08317d01d55717672af","label":"benjamine/jsondiffpatch@381c012"},"references":[{"type":"WEB","url":"https://gist.github.com/yuki-matsuhashi/e570fb1579ae1f3190059b622b0473fb"},{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8657.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8657"},{"type":"FIX","url":"https://github.com/benjamine/jsondiffpatch/commit/381c0125efab49f6f0dbc08317d01d55717672af"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-02T03:55:58.149475182Z"}}