CVE-2025-6566Public exploitNetwork attack vector

Service crash via unbounded recursive array parsing

Published Jun 24, 2025 · Updated Jun 24, 2025

Stack exhaustion in Oat++ 1.3.0 and 1.3.1 allows remote attackers to crash applications via deeply nested JSON arrays. The deserializeArray routine recursively invokes deserialize for every nested array without enforcing a depth limit, exhausting the process stack. Any network endpoint that passes attacker-controlled JSON to the object mapper exposes the hosting process to unauthenticated service interruption.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack exhaustion in Oat++ 1.3.0 and 1.3.1 allows remote attackers to crash applications via deeply nested JSON arrays. The deserializeArray routine recursively invokes deserialize for every nested array without enforcing a depth limit, exhausting the process stack. Any network endpoint that passes attacker-controlled JSON to the object mapper exposes the hosting process to unauthenticated service interruption.

The record

CVE
CVE-2025-6566
Published
Jun 24, 2025
Updated
Jun 24, 2025
Vendor
Oat++
Product
Oat++
Classifications
CWE-121, CWE-787, CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=1.3.0
  2. Affected versionversion=1.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oat++ · Oat++version=1.3.0; version=1.3.1

Published CVSS scores

5.0VulDBAV:N/AC:L/Au:N/C:N/I:N/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-121Stack-based Buffer Overflow
CWE-787Out-of-bounds Write
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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