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CVE-2026-8657

jsondiffpatch · Vulnerability

CVSS 3.1 8.2 HIGHCVSS 4.0 8.8 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-8657

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-8657

Published

jsondiffpatch

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "jsondiffpatch",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "0.7.6",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "vendor": "n/a"
                }

org.webjars.npm:jsondiffpatch

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "org.webjars.npm:jsondiffpatch",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "*",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "vendor": "n/a"
                }

Original source record · Cite this exact observation · Complete original publisher JSON