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CVE-2026-87933— DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after free

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.

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 1.7.19及之前版本存在安全漏洞，该漏洞源于文件cJSON_Utils.c中函数cJSONUtils_MergePatch操作导致释放后重用，攻击者可远程利用该漏洞。

CVSS 7.3 · High EPSS 0.53% · P45

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 20

VendorProduct Version RangeStatus
DaveGamble cJSON 1.7.0 affected
1.7.1 affected
1.7.2 affected
1.7.3 affected
1.7.4 affected
1.7.5 affected
1.7.6 affected
1.7.7 affected
… +12 more rows
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I. Basic Information for CVE-2026-87933

Vulnerability Information
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Vulnerability Title
DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after free
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in DaveGamble cJSON up to 1.7.19. The affected element is the function cJSONUtils_MergePatch of the file cJSON_Utils.c. The manipulation results in use after free. The attack may be launched remotely. The exploit has been made public and could be used. The pull request to fix this issue awaits acceptance.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Dave Gamble cJSON 缓冲区错误漏洞
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 1.7.19及之前版本存在安全漏洞，该漏洞源于文件cJSON_Utils.c中函数cJSONUtils_MergePatch操作导致释放后重用，攻击者可远程利用该漏洞。
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 1.7.0 cpe:2.3:a:davegamble:cjson:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-87933

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III. Intelligence Information for CVE-2026-87933

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Patches & Fixes for CVE-2026-87933 (1)

Proof of Concept for CVE-2026-87933 (1)

Vendor Pages for CVE-2026-87933 (1)

IV. Related Vulnerabilities

Same product: cJSON
Same vendor: DaveGamble
Same weakness: CWE-416