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Vulnerabilities CVE-2026-67217

CVE-2026-67217

Medium
Open
TLP:CLEAR

cJSON JSON Patch Non-Atomic Application Destroys Data Before Validation

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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.

Details

CVSS Score
6.9
EPSS Score
0.25%

16.6th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Jul 29, 2026
Last Modified
Jul 29, 2026
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