Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Davegamble | Cjson | <= 1.7.19 |
Related Weaknesses (CWE)
References
- https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.c#L887-L948Patch
- https://joshua.hu/cjson-json-parser-cve-vulnerabilitiesExploitPress/Media CoverageThird Party Advisory
- https://www.vulncheck.com/advisories/cjson-json-patch-non-atomic-application-desThird Party Advisory
- https://joshua.hu/cjson-json-parser-cve-vulnerabilitiesExploitPress/Media CoverageThird Party Advisory
FAQ
What is CVE-2026-67217?
CVE-2026-67217 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 destin...
How severe is CVE-2026-67217?
CVE-2026-67217 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67217?
Check the references section above for vendor advisories and patch information. Affected products include: Davegamble Cjson.