{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "1.7.19"
              },
              {
                "fixed": "1.7.19"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "c859b25da02955fef659d658b8f324b5cde87be3"
            }
          ],
          "repo": "https://github.com/davegamble/cjson",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67216.json"
  },
  "details": "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.",
  "id": "CVE-2026-67216",
  "modified": "2026-07-31T03:33:56.953787910Z",
  "published": "2026-07-29T13:32:03.696Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67216.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67216"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/cjson-cjson-compare-exponential-complexity-denial-of-service"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L3057-L3180"
    },
    {
      "type": "EVIDENCE",
      "url": "https://joshua.hu/cjson-json-parser-cve-vulnerabilities"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "cJSON cJSON_Compare Exponential Complexity Denial of Service"
}