Vulnerability Description
cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied via cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive(). A patch containing add and copy operations grafts duplicated subtrees to amplify document depth beyond the parser's nesting limit: cJSON_Delete() recurses with no depth bound, and the cJSON_Duplicate() guard CJSON_CIRCULAR_LIMIT is set to 10000, ten times the parser's 1000-level nesting limit and high enough to overflow a default thread stack. An attacker who can supply the patch document can crash the process, resulting in denial of service.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Davegamble | Cjson | <= 1.7.19 |
Related Weaknesses (CWE)
References
- https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L253-L261Patch
- https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.c#L906-L940Patch
- https://joshua.hu/cjson-json-parser-cve-vulnerabilitiesExploitPress/Media CoverageThird Party Advisory
- https://www.vulncheck.com/advisories/cjson-json-patch-copy-add-uncontrolled-recuThird Party Advisory
- https://joshua.hu/cjson-json-parser-cve-vulnerabilitiesExploitPress/Media CoverageThird Party Advisory
FAQ
What is CVE-2026-67215?
CVE-2026-67215 is a vulnerability with a CVSS score of 7.5 (HIGH). cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied via cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSe...
How severe is CVE-2026-67215?
CVE-2026-67215 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-67215?
Check the references section above for vendor advisories and patch information. Affected products include: Davegamble Cjson.