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01 Record

CVE-2021-26707

The merge-deep library before 3.0.3 for Node.js can be tricked into overwriting properties of Object.prototype or adding new properties to it. These properties are then inherited by every object in

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector
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02 Description

The merge-deep library before 3.0.3 for Node.js can be tricked into overwriting properties of Object.prototype or adding new properties to it. These properties are then inherited by every object in

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
1.91% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 79.7% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2021-06-02 14:24Z5 YR AGO
Last updated
2024-08-03 20:33Z2 YR AGO
Reserved
2021-02-05
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')Variant
  • CWE-915Improperly Controlled Modification of Dynamically-Determined Object AttributesBase
Data version
5.1
Document digest
d6f0039733daa035c57207e998cc9c1f115a17da6ca0682672a4532f633f6d99

05 Affected products

VendorProductVersionsPlatforms
merge-deep_projectmerge-deepNot specified—
netappe-series_performance_analyzerNot specified—
redhatopenshiftNot specified—
redhatservice_meshNot specified—

06 References