CVE-2023-42276Public exploitNetwork attack vector

Service interruption via unchecked JSONArray index

Published Sep 8, 2023 · Updated Sep 26, 2024

Resource exhaustion in Hutool JSON 5.8.21 and earlier allows attackers to exhaust Java heap memory through an oversized array index. The JSONArray.add(int, Object) method pads the backing list with null entries until it reaches the supplied index without first bounding that index. Reachability requires consuming code to pass an attacker-controlled index; the demonstrated consequence is an OutOfMemoryError in the hosting JVM.

CVSS severity9.8
Critical
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Hutool JSON 5.8.21 and earlier allows attackers to exhaust Java heap memory through an oversized array index. The JSONArray.add(int, Object) method pads the backing list with null entries until it reaches the supplied index without first bounding that index. Reachability requires consuming code to pass an attacker-controlled index; the demonstrated consequence is an OutOfMemoryError in the hosting JVM.

The record

CVE
CVE-2023-42276
Published
Sep 8, 2023
Updated
Sep 26, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 26, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

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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