CVE-2026-67215

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L253-L261	Patch
https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.c#L906-L940	Patch
https://joshua.hu/cjson-json-parser-cve-vulnerabilities	Exploit Press/Media Coverage Third Party Advisory
https://www.vulncheck.com/advisories/cjson-json-patch-copy-add-uncontrolled-recursion-stack-exhaustion	Third Party Advisory
https://joshua.hu/cjson-json-parser-cve-vulnerabilities	Exploit Press/Media Coverage Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:davegamble:cjson:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-29 14:16

Updated : 2026-08-04 15:09

NVD link : CVE-2026-67215

Mitre link : CVE-2026-67215

CVE.ORG link : CVE-2026-67215

JSON object : View

Products Affected

davegamble

cjson

CWE

CWE-674

Uncontrolled Recursion

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