---
cve: "CVE-2026-67216"
severity: "HIGH"
cvss: 8.2
epss: "0.6%"
vendor: "DaveGamble"
kev: false
exploited: false
published: "2026-07-29 14:16:35"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-04T18:16:39+02:00"
---

# CVE-2026-67216

> 8.2 HIGH · 🧪 PoC

## Beschreibung

cJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). When comparing objects, the function recurses into each shared subtree twice, once in each direction, with no depth guard, making the running time exponential in nesting depth. A small, deeply nested document of a few hundred bytes (depth around 40) compared for equality consumes hours of CPU, and the cost roughly doubles with each additional level of nesting. An application that calls cJSON_Compare() on attacker-influenced JSON that is structurally equal to a reference document is exposed to a denial-of-service condition.

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **partial**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/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#L3057-L3180>
- <https://www.vulncheck.com/advisories/cjson-cjson-compare-exponential-complexity-denial-of-service>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-67216) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_