Cyber Posture

CVE-2026-8657

High

Published: 16 May 2026

Published
16 May 2026
Modified
16 May 2026
KEV Added
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Patch
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CVSS Score 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
EPSS Score 0.0005 15.7th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-8657 is a high-severity Prototype Pollution (CWE-1321) vulnerability in Snyk (inferred from references). Its CVSS base score is 8.2 (High).

Operationally, ranked at the 15.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

NVD 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…

more

used to traverse and modify objects without restricting access to special properties like __proto__ or constructor.prototype, allowing modification of Object.prototype.

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)
CWE-1321

Affected Products

Snyk
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inferred from references and description; NVD did not file a CPE for this CVE

References