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CVE-2026-67215— cJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion

Quick assessment

Affected
DaveGamble cJSON
Exploitation
Public or AI PoC available; prioritize validation
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，该漏洞源于应用不受信任的RFC 6902 JSON Patch时，包含add和copy操作的补丁导致无限递归，触发栈耗尽，攻击者可利用此漏洞造成拒绝服务。

CVSS 7.5 · High EPSS 0.70% · P52

Affected Version Matrix 1

VendorProduct Version RangeStatus
DaveGamble cJSON ≤ 1.7.19 affected
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I. Basic Information for CVE-2026-67215

Vulnerability Information
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Vulnerability Title
cJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied via cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive(). A patch containing add and copy operations grafts duplicated subtrees to amplify document depth beyond the parser's nesting limit: cJSON_Delete() recurses with no depth bound, and the cJSON_Duplicate() guard CJSON_CIRCULAR_LIMIT is set to 10000, ten times the parser's 1000-level nesting limit and high enough to overflow a default thread stack. An attacker who can supply the patch document can crash the process, resulting in denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
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，该漏洞源于应用不受信任的RFC 6902 JSON Patch时，包含add和copy操作的补丁导致无限递归，触发栈耗尽，攻击者可利用此漏洞造成拒绝服务。
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-2026-67215

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8568 chars
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III. Intelligence Information for CVE-2026-67215

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Vendor Advisories for CVE-2026-67215 (1)

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

CVE-2026-67216 5.9 MEDIUM cJSON cJSON_Compare Exponential Complexity Denial of Service
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-674

V. Comments for CVE-2026-67215

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