CVE-2024-38993Public exploitNetwork attack vector

Prototype pollution via unfiltered __proto__ property

Published Jul 1, 2024 · Updated Aug 2, 2024

Prototype pollution in Jsonic 2.12.1 allows attackers to modify Object.prototype by passing a crafted proto property to empty. The empty utility processes an attacker-controlled proto property without filtering it, allowing supplied properties to reach the shared prototype. The function is an undocumented internal utility, and the maintainer disputes reachability through the public Jsonic parser API; impact depends on a usable downstream gadget.

CVSS severity9.8
Critical
EPSS probability0.88%
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 Jsonic 2.12.1 allows attackers to modify Object.prototype by passing a crafted proto property to empty. The empty utility processes an attacker-controlled proto property without filtering it, allowing supplied properties to reach the shared prototype. The function is an undocumented internal utility, and the maintainer disputes reachability through the public Jsonic parser API; impact depends on a usable downstream gadget.

The record

CVE
CVE-2024-38993
Published
Jul 1, 2024
Updated
Aug 2, 2024
Vendor
Richard Rodger
Product
Jsonic
Classifications
CWE-1321, CWE-94
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 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=2.12.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Richard Rodger · Jsonicversion=2.12.1

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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')
CWE-94Improper Control of Generation of Code ('Code Injection')

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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