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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Davegamble
  • Cjson

No data.

No data.

References
Link Providers
https://github.com/DaveGamble/cJSON/ cve-icon cve-icon cve-icon
https://github.com/DaveGamble/cJSON/issues/1060 cve-icon cve-icon cve-icon
https://github.com/DaveGamble/cJSON/pull/1065 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-87933 cve-icon
https://vuldb.com/cve/CVE-2026-87933 cve-icon cve-icon cve-icon
https://vuldb.com/submit/911136 cve-icon cve-icon cve-icon
https://vuldb.com/vuln/401815 cve-icon cve-icon cve-icon
https://vuldb.com/vuln/401815/cti cve-icon cve-icon cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-87933 cve-icon
History

Sat, 12 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

 threat_severity

Important

Thu, 10 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Thu, 10 Sep 2026 01:00:00 +0000

Type Values Removed Values Added
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.
Title DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after free
First Time appeared Davegamble
Davegamble cjson
Weaknesses CWE-119
CWE-416
CPEs cpe:2.3:a:davegamble:cjson:*:*:*:*:*:*:*:*
Vendors & Products Davegamble
Davegamble cjson
References
Metrics cvssV2_0

{'score': 7.5, 'vector': 'AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 7.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-09-10T00:15:08.473Z

Updated: 2026-09-10T19:06:09.220Z

Reserved: 2026-09-09T16:21:04.414Z

Link: CVE-2026-87933

cve-icon Vulnrichment

Updated: 2026-09-10T18:13:18.876Z

cve-icon NVD

Status : Deferred

Published: 2026-09-10T01:16:35.650

Modified: 2026-09-10T20:17:31.073

Link: CVE-2026-87933

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-10T00:15:08Z

Links: CVE-2026-87933 - Bugzilla