CVE-2026-67217

cJSON through 1.7.19 applies RFC 6902 JSON Patch operations non-atomically in apply_patch() in cJSON_Utils.c. For a replace operation that is missing its value member, or a move operation whose destination path cannot be resolved, the existing target member is detached and deleted before the operation is fully validated, so the target document is mutated while cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() returns a failure status. An attacker who can supply the patch document can destroy addressable members of the target document even though the API reports that the patch failed, defeating the all-or-nothing behavior callers rely on to reject bad patches.

• CWE-696

• https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.c#L887-L948Patch
• https://joshua.hu/cjson-json-parser-cve-vulnerabilitiesExploit, Press/Media Coverage, Third Party Advisory
• https://www.vulncheck.com/advisories/cjson-json-patch-non-atomic-application-destroys-data-before-validationThird Party Advisory
• https://joshua.hu/cjson-json-parser-cve-vulnerabilitiesExploit, Press/Media Coverage, Third Party Advisory

Published

Jul 29, 2026

Last Modified

Aug 4, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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