CVE-2026-67215Public exploitNetwork attack vector

Process crash via recursive JSON Patch subtree grafting

Published Jul 29, 2026 · Updated Jul 29, 2026

Uncontrolled recursion in Dave Gamble cJSON 1.7.19 and earlier allows remote attackers to crash an integrating process via an untrusted JSON Patch. The copy and add paths duplicate and graft subtrees without enforcing the parser's 1000-level limit, while cJSON_Delete recursively frees the resulting tree without a depth bound. Reachability requires a host application to pass attacker-supplied patches to a cJSONUtils patch function; successful exploitation interrupts that application through a process crash.

CVSS severity8.7
High
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in Dave Gamble cJSON 1.7.19 and earlier allows remote attackers to crash an integrating process via an untrusted JSON Patch. The copy and add paths duplicate and graft subtrees without enforcing the parser's 1000-level limit, while cJSON_Delete recursively frees the resulting tree without a depth bound. Reachability requires a host application to pass attacker-supplied patches to a cJSONUtils patch function; successful exploitation interrupts that application through a process crash.

The record

CVE
CVE-2026-67215
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
cJSON Project
Product
cJSON
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record 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 <=1.7.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

cJSON Project · cJSONversion=0 <=1.7.19

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7VulnCheckCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-674Uncontrolled Recursion
T1499.004Endpoint Denial of Service Application 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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