Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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

CVSS 5.9 · Medium EPSS 0.35% · P28

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProductVersion RangeStatus
DaveGamblecJSON≤ 1.7.19affected
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2026-67216

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

VendorProductAffected VersionsCPESubscribe
DaveGamblecJSON 0 ~ 1.7.19 -

II. Public POCs for CVE-2026-67216

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-67216

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-67216 (1)

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

CVE-2026-672157.5 HIGHcJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion
CVE-2026-672175.3 MEDIUMcJSON 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

No comments yet

Leave a comment