CVE-2026-67217
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 16% of all known CVEs.
References
Related Vulnerabilities
Other CWE-696 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2023-33224 | High | 7.2 | 2.8% | - | Fix |
| CVE-2021-22569 | High | 7.5 | 1.7% | - | Fix |
| CVE-2021-31379 | High | 7.5 | 1.3% | - | - |
| CVE-2023-44386 | Medium | 5.3 | 0.6% | - | Fix |
| CVE-2025-31485 | High | 7.5 | 0.6% | - | - |
| CVE-2025-0150 | High | 7.1 | 0.5% | - | Fix |
Common questions
How do I fix CVE-2026-67217?
No published fix for CVE-2026-67217 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-67217 being actively exploited?
Not that we know of. CVE-2026-67217 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.25% is the estimated probability that it will be exploited in the next 30 days. That is higher than 16% of all scored CVEs.
How severe is CVE-2026-67217?
CVE-2026-67217 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-04.