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CVE-2026-29036— cJSON 1.7.19 Wrong-Key Modification via JSON Pointer Escape Decoding

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.

Dave Gamble cJSON是Dave Gamble个人开发者开源的一款轻量级的开源JSON解析器 Dave Gamble cJSON 1.5.0版本至1.7.19版本存在输入验证错误漏洞，该漏洞源于cJSON_Utils.c文件中的decode_pointer_inplace()函数错误解析名称或引用，未正确处理JSON Pointer转义序列（~0或~1），导致JSON Patch操作定位错误对象键，未经身份验证的攻击者可通过提交恶意RFC 6902 JSON Patch输入，造成数据损坏或删除

CVSS 7.5 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
DaveGamble cJSON 1.5.0≤ 1.7.19 affected
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I. Basic Information for CVE-2026-29036

Vulnerability Information
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Vulnerability Title
cJSON 1.7.19 Wrong-Key Modification via JSON Pointer Escape Decoding
Source: CVE Program / CVE List V5
Vulnerability Description
cJSON versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
Source: CVE Program / CVE List V5
Vulnerability Title
Dave Gamble cJSON 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dave Gamble cJSON是Dave Gamble个人开发者开源的一款轻量级的开源JSON解析器 Dave Gamble cJSON 1.5.0版本至1.7.19版本存在输入验证错误漏洞，该漏洞源于cJSON_Utils.c文件中的decode_pointer_inplace()函数错误解析名称或引用，未正确处理JSON Pointer转义序列（~0或~1），导致JSON Patch操作定位错误对象键，未经身份验证的攻击者可通过提交恶意RFC 6902 JSON Patch输入，造成数据损坏或删除
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 1.5.0 ~ 1.7.19 -

II. Public POCs for CVE-2026-29036

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8300 chars
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III. Intelligence Information for CVE-2026-29036

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Patches & Fixes for CVE-2026-29036 (1)

Vendor Advisories for CVE-2026-29036 (1)

IV. Related Vulnerabilities

Same product: cJSON
Same vendor: DaveGamble
Same weakness: CWE-706

V. Comments for CVE-2026-29036

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