PT-2021-17103

CVE-2021-26707

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Published

2021-06-02

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Updated

2026-08-28

Description by

CVSS 3.1
9.8
Critical
MetricsAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Name of the Vulnerable Software and Affected Versions merge-deep library versions prior to 3.0.3
Description The issue allows an attacker to trick the library into overwriting properties of Object.prototype or adding new properties to it. These properties are then inherited by every object in the program, facilitating prototype-pollution attacks against applications using this library.
Recommendations For merge-deep library versions prior to 3.0.3, update to version 3.0.3 or later to resolve the issue.
Exploitability
Fix
Impacts
Researchers
Vendors
Affected products
Related identifiers
GHSA-R6RJ-9CH6-G264
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