CVE-2026-87933

DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after free

State: Published
Severity: 6.9 Medium
Published: Sep 10, 2026
Updated: Sep 10, 2026
Reserved: Sep 9, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	VulDB
3.1	7.3 High	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	VulDB
3.0	7.3 High	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	VulDB
2.0	7.5 High	AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR	VulDB

Weaknesses

CWE-416 Use After Free
CWE-119 Memory Corruption

Affected Products

Product	Versions
cJSONDaveGamble	1.7.0Affected 1.7.1Affected 1.7.2Affected 1.7.3Affected 1.7.4Affected 1.7.5Affected 1.7.6Affected 1.7.7Affected 1.7.8Affected 1.7.9Affected 1.7.10Affected 1.7.11Affected 1.7.12Affected 1.7.13Affected 1.7.14Affected 1.7.15Affected 1.7.16Affected 1.7.17Affected 1.7.18Affected 1.7.19Affected

References

VDB-401815 | DaveGamble cJSON cJSON_Utils.c cJSONUtils_MergePatch use after freevdb-entrytechnical-description
VDB-401815 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
CVE-2026-87933 | CVE Analysis and Reportthird-party-advisory
Submit #911136 | DaveGamble cJSON v1.7.19 Use After Freethird-party-advisory
https://github.com/DaveGamble/cJSON/issues/1060exploitissue-tracking
https://github.com/DaveGamble/cJSON/pull/1065issue-trackingpatch
https://github.com/DaveGamble/cJSON/product

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