CVE-2024-38986Public exploitNetwork attack vector

Code execution via unsafe prototype-property merging

Published Jul 30, 2024 · Updated Aug 2, 2024

Prototype pollution in 75lb @75lb/deep-merge 1.1.1 and earlier allows attackers to alter inherited object behavior through crafted input. The default merge function passes attacker-controlled objects to a vulnerable lodash assignWith implementation that follows proto or constructor.prototype keys and writes into Object.prototype. Exploitation requires consuming code to pass untrusted properties into the merge call; polluted values can corrupt application logic, crash the process, or enable code execution when a suitable application gadget exists.

CVSS severity9.8
Critical
EPSS probability0.98%
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 75lb @75lb/deep-merge 1.1.1 and earlier allows attackers to alter inherited object behavior through crafted input. The default merge function passes attacker-controlled objects to a vulnerable lodash assignWith implementation that follows proto or constructor.prototype keys and writes into Object.prototype. Exploitation requires consuming code to pass untrusted properties into the merge call; polluted values can corrupt application logic, crash the process, or enable code execution when a suitable application gadget exists.

The record

CVE
CVE-2024-38986
Published
Jul 30, 2024
Updated
Aug 2, 2024
Vendor
75lb
Product
@75lb/deep-merge
Classifications
CWE-1321
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

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

  1. Affected versionversion=1.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

75lb · @75lb/deep-mergeversion=1.1.1

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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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