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

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-10 · updated 2026-09-10
Weakness: CWE-119

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.

Affected products

DaveGamble cJSON: 1.7.0, 1.7.1, 1.7.2, 1.7.3, 1.7.4, 1.7.5 (+14)

References

https://github.com/DaveGamble/cJSON/
https://github.com/DaveGamble/cJSON/issues/1060
https://github.com/DaveGamble/cJSON/pull/1065
https://vuldb.com/cve/CVE-2026-87933
https://vuldb.com/submit/911136
https://vuldb.com/vuln/401815
https://vuldb.com/vuln/401815/cti

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