---
cve: "CVE-2026-67215"
severity: "HIGH"
cvss: 8.7
epss: "0.5%"
vendor: "DaveGamble"
kev: false
exploited: false
published: "2026-07-29 14:16:35"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-01T02:14:45+02:00"
---

# CVE-2026-67215

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Referenzen

- <https://joshua.hu/cjson-json-parser-cve-vulnerabilities>
- <https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L253-L261>
- <https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.c#L906-L940>
- <https://www.vulncheck.com/advisories/cjson-json-patch-copy-add-uncontrolled-recursion-stack-exhaustion>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67215) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_