GitHub Advisoryadvisory · npm
GHSA-j4fx-xxwh-2485 jsondiffpatch patch APIs are vulnerable to prototype pollution
HIGH
Official page ↗
- Aliases
- CVE-2026-8657
- Ecosystem
- npm
- Packages
- jsondiffpatch
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
- Weaknesses
- CWE-1321
- Reviewed
- 2026-08-31
Affected packages
• npm jsondiffpatch: < 0.7.6 → fixed in 0.7.6
Description
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.
Related
Alias · CVE (1)
- CVE-2026-8657 Versions of the package jsondiffpatch before 0.7.6 are vulnerable to Prototype Pollution via the jsondiffpatch.patch() and… vulnerability
Weakness · CWE (1)
- CWE-1321 Improperly Controlled Modification of Object Prototype Attributes weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-8657 advisory
- https://github.com/benjamine/jsondiffpatch/commit/381c0125efab49f6f0dbc08317d01d55717672af web
- https://gist.github.com/yuki-matsuhashi/e570fb1579ae1f3190059b622b0473fb web
- https://github.com/benjamine/jsondiffpatch package
- https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/filters/nested.ts%23L107-L115 web
- https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/filters/nested.ts%23L82-L87 web
- https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/formatters/jsonpatch-apply.ts%23L146-L168 web
- https://github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a952c79e2fe/packages/jsondiffpatch/src/formatters/jsonpatch-apply.ts%23L171-L199 web
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-16732792 web
- https://security.snyk.io/vuln/SNYK-JS-JSONDIFFPATCH-16322990 web