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CVE-2026-67217— cJSON JSON Patch Non-Atomic Application Destroys Data Before Validation

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及之前版本存在处理逻辑错误漏洞，该漏洞源于apply_patch()函数对JSON Patch操作的非原子处理，可能导致攻击者在操作验证失败时仍能破坏目标文档的可寻址成员。

CVSS 5.3 · Medium EPSS 0.43% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
DaveGamble cJSON ≤ 1.7.19 affected
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I. Basic Information for CVE-2026-67217

Vulnerability Information
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Vulnerability Title
cJSON JSON Patch Non-Atomic Application Destroys Data Before Validation
Source: CVE Program / CVE List V5
Vulnerability Description
cJSON through 1.7.19 applies RFC 6902 JSON Patch operations non-atomically in apply_patch() in cJSON_Utils.c. For a replace operation that is missing its value member, or a move operation whose destination path cannot be resolved, the existing target member is detached and deleted before the operation is fully validated, so the target document is mutated while cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() returns a failure status. An attacker who can supply the patch document can destroy addressable members of the target document even though the API reports that the patch failed, defeating the all-or-nothing behavior callers rely on to reject bad patches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序
Source: CVE Program / CVE List V5
Vulnerability Title
davegamble cjson 处理逻辑错误漏洞
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及之前版本存在处理逻辑错误漏洞，该漏洞源于apply_patch()函数对JSON Patch操作的非原子处理，可能导致攻击者在操作验证失败时仍能破坏目标文档的可寻址成员。
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-2026-67217

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III. Intelligence Information for CVE-2026-67217

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Vendor Advisories for CVE-2026-67217 (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-2026-67216 5.9 MEDIUM cJSON cJSON_Compare Exponential Complexity Denial of Service

IV. Related Vulnerabilities

Same product: cJSON
Same vendor: DaveGamble
Same weakness: CWE-696