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CVE-2026-67216— cJSON cJSON_Compare Exponential Complexity Denial of Service

Quick assessment

Affected
DaveGamble cJSON
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

davegamble cJSON是davegamble个人开发者开源的一款轻量级的开源JSON解析器。 davegamble cjson 1.7.19及之前版本存在资源管理错误漏洞，该漏洞源于cJSON_Compare()函数存在低效的算法复杂度缺陷，递归比较嵌套深度大的对象时CPU消耗过高，造成拒绝服务。

CVSS 5.9 · Medium EPSS 0.65% · P49

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
DaveGamble cJSON ≤ 1.7.19 affected
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I. Basic Information for CVE-2026-67216

Vulnerability Information
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Vulnerability Title
cJSON cJSON_Compare Exponential Complexity Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
cJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). When comparing objects, the function recurses into each shared subtree twice, once in each direction, with no depth guard, making the running time exponential in nesting depth. A small, deeply nested document of a few hundred bytes (depth around 40) compared for equality consumes hours of CPU, and the cost roughly doubles with each additional level of nesting. An application that calls cJSON_Compare() on attacker-influenced JSON that is structurally equal to a reference document is exposed to a denial-of-service condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
davegamble cjson 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
davegamble cJSON是davegamble个人开发者开源的一款轻量级的开源JSON解析器。 davegamble cjson 1.7.19及之前版本存在资源管理错误漏洞，该漏洞源于cJSON_Compare()函数存在低效的算法复杂度缺陷，递归比较嵌套深度大的对象时CPU消耗过高，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
DaveGamble cJSON 0 ~ 1.7.19 -

II. Public POCs for CVE-2026-67216

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III. Intelligence Information for CVE-2026-67216

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Vendor Advisories for CVE-2026-67216 (1)

Same Patch Batch · DaveGamble · 2026-07-29 · 3 CVEs total

CVE-2026-67215 7.5 HIGH cJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion
CVE-2026-67217 5.3 MEDIUM cJSON JSON Patch Non-Atomic Application Destroys Data Before Validation

IV. Related Vulnerabilities

Same product: cJSON
Same vendor: DaveGamble
Same weakness: CWE-407

V. Comments for CVE-2026-67216

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