CVE-2026-8657

HIGH
8.2
CVSS Score
Published: May 16, 2026 at 05:00 AM UTC
Updated: July 5, 2026 at 04:37 PM UTC
2 products affected across 2 vendorsJsondiffpatchJsondiffpatch

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Severity
HIGH8.2
Exploit prediction
EPSS 0.4%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 0.7.6
Affected range stops below 0.7.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.2HIGHsnyk
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
LOW
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-1321

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