CVE-2022-31106Public exploitNetwork attack vector

Prototype pollution via unsafe deepFromFlat path traversal

Published Jun 28, 2022 · Updated Apr 22, 2025

Prototype pollution in Clever underscore.deep before 0.5.3 allows attackers to modify future objects through crafted flattened keys. deepFromFlat walks dot-separated key paths and assigns into t[part] without rejecting proto, constructor, or prototype segments. Applications are exposed only when attacker-controlled data reaches deepFromFlat directly or through deepPick; inherited properties can then alter application behavior.

CVSS severity8.3
High
EPSS probability1.05%
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 Clever underscore.deep before 0.5.3 allows attackers to modify future objects through crafted flattened keys. deepFromFlat walks dot-separated key paths and assigns into t[part] without rejecting proto, constructor, or prototype segments. Applications are exposed only when attacker-controlled data reaches deepFromFlat directly or through deepPick; inherited properties can then alter application behavior.

The record

CVE
CVE-2022-31106
Published
Jun 28, 2022
Updated
Apr 22, 2025
Vendor
Clever
Product
underscore.deep
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Clever · underscore.deepversion=< 0.5.3

Published CVSS scores

8.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
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

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')

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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