CVE-2026-8657
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductJsondiffpatch
PublishedMay 16, 2026
First seenMay 16, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Update
- jsondiffpatch0.7.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jsondiffpatchnpm | v < 0.7.6 | 0.7.6 |
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