CVE-2026-67217 – cJSON JSON Patch Non-Atomic Application Destroys Data Before Validation

CVE ID :CVE-2026-67217

Published : July 29, 2026, 2:16 p.m. | 24 minutes ago

Description :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.

Severity: 6.9 | MEDIUM

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