{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-67216", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-07-28T19:20:19.157Z", "datePublished": "2026-07-29T13:32:03.696Z", "dateUpdated": "2026-07-29T16:00:06.548Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-07-29T16:00:06.548Z"}, "title": "cJSON cJSON_Compare Exponential Complexity Denial of Service", "descriptions": [{"lang": "en", "value": "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."}], "datePublic": "2026-07-25T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-407", "description": "Inefficient Algorithmic Complexity", "type": "CWE"}]}], "affected": [{"vendor": "DaveGamble", "product": "cJSON", "defaultStatus": "affected", "versions": [{"status": "affected", "version": "0", "versionType": "semver", "lessThanOrEqual": "1.7.19"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:davegamble:cjson:*:*:*:*:*:*:*:*"}]}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.2, "vectorString": "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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "MEDIUM", "baseScore": 5.9, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}}], "references": [{"url": "https://joshua.hu/cjson-json-parser-cve-vulnerabilities", "tags": ["exploit"], "name": "Security vulnerabilities in the cJSON JSON parser (Joshua Rogers)"}, {"url": "https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L3057-L3180", "tags": ["technical-description"], "name": "cJSON_Compare double-recursion object comparison (cJSON.c)"}, {"name": "VulnCheck Advisory: cJSON cJSON_Compare Exponential Complexity Denial of Service", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/cjson-cjson-compare-exponential-complexity-denial-of-service"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.7.19]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "cJSON", "source": "cna", "vendor": "DaveGamble"}, "product": "cjson", "vendor": "davegamble"}], "created": "2026-07-29T15:45:03.852178+00:00", "updated": "2026-07-29T15:45:03.852199+00:00", "vendors": ["davegamble", "davegamble$PRODUCT$cjson"]}