CVE-2022-21231Public exploitNetwork attack vector

Prototype pollution via nested array path bypass

Published Jun 24, 2022 · Updated Sep 17, 2024

Prototype pollution in deep-get-set 1.1.1 and earlier allows attackers to pollute Object.prototype through the deep() API. The deep function treats a nested array path element such as ["proto"] as safe because its key filter compares only scalar strings, then assigns the supplied value through that inherited prototype path. Exploitation requires a consuming application to pass an attacker-controlled array path and value; resulting behavior depends on how that application uses inherited properties.

CVSS severity7.5
High
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in deep-get-set 1.1.1 and earlier allows attackers to pollute Object.prototype through the deep() API. The deep function treats a nested array path element such as ["proto"] as safe because its key filter compares only scalar strings, then assigns the supplied value through that inherited prototype path. Exploitation requires a consuming application to pass an attacker-controlled array path and value; resulting behavior depends on how that application uses inherited properties.

The record

CVE
CVE-2022-21231
Published
Jun 24, 2022
Updated
Sep 17, 2024
Vendor
Arturo Castillo Delgado
Product
deep-get-set
Classifications
CWE-1321, CAPEC-77
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arturo Castillo Delgado · deep-get-setversion=0 <unspecified

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
7.5SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CAPEC-77Manipulating User-Controlled Variables

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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