CVE-2026-67215 – cJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion

CVE ID :CVE-2026-67215

Published : July 29, 2026, 2:16 p.m. | 24 minutes ago

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.

Severity: 8.7 | HIGH

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