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 op
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
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-67217
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-672170.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-67217 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for cJSON
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCVE-2026-67216: cJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). W…nvd · 2026-07-29
- highCVE-2026-67215: cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when …nvd · 2026-07-29
- unknownCVE-2026-16554: cJSON library is vulnerable to an integer overflow in the print_string_ptr() function in cJSON…nvd · 2026-07-27
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