CVE-2026-8657
Summary
| CVE | CVE-2026-8657 |
|---|---|
| State | PUBLISHED |
| Assigner | snyk |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-16 06:16:18 UTC |
| Updated | 2026-05-19 15:38:48 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 7.8 HIGH from [email protected]
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS: 0.000660000 probability, percentile 0.203080000 (date 2026-05-26)
Problem Types: CWE-1321 | CWE-1321 Prototype Pollution | CWE-1321 CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 7.8 | HIGH | 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/C... |
| 4.0 | CNA | DECLARED | 8.8 | HIGH | 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 |
| 3.1 | [email protected] | Secondary | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L |
| 3.1 | CNA | DECLARED | 8.2 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L/E:P |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
NoneUser Interaction
NoneConfidentiality
NoneIntegrity
HighAvailability
LowSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
HighAvailability
LowCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Na | Jsondiffpatch | affected 0.7.6 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| security.snyk.io/vuln/SNYK-JS-JSONDIFFPATCH-16322990 | [email protected] | security.snyk.io | |
| github.com/benjamine/jsondiffpatch/commit/381c0125efab49f6f0dbc08317d01d... | [email protected] | github.com | |
| github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a95... | [email protected] | github.com | |
| github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a95... | [email protected] | github.com | |
| github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a95... | [email protected] | github.com | |
| github.com/benjamine/jsondiffpatch/blob/96112c35a98f9201dd75d67fcee68a95... | [email protected] | github.com | |
| gist.github.com/yuki-matsuhashi/e570fb1579ae1f3190059b622b0473fb | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | gist.github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Yuki Matsuhashi (en)
There are currently no legacy QID mappings associated with this CVE.