Vulnerability-Lookup

ubuntu-cve-2026-67216

Vulnerability from osv_ubuntu

Published

2026-07-30 00:00

Modified

2026-07-31 12:09

Summary

Details

(cJSON through 1.7.19 contains an inefficient algorithmic complexity fl ...)

Severity

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

8.2 (High)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-67216	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-67216	REPORT
	https://joshua.hu/cjson-json-parser-cve-vulnerabilities	REPORT

JSON

To clipboard

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  ],
  "aliases": [],
  "details": "(cJSON through 1.7.19 contains an inefficient algorithmic complexity fl ...)",
  "id": "UBUNTU-CVE-2026-67216",
  "modified": "2026-07-31T12:09:41Z",
  "published": "2026-07-30T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-67216"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-67216"
    },
    {
      "type": "REPORT",
      "url": "https://joshua.hu/cjson-json-parser-cve-vulnerabilities"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "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"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-67216"
  ]
}

CVE-2026-67216 (GCVE-0-2026-67216)

Vulnerability from cvelistv5 – Published: 2026-07-29 13:32 – Updated: 2026-07-30 15:19

Title

cJSON cJSON_Compare Exponential Complexity Denial of Service

Summary

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.

Severity

8.2 (High)


                        
                          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

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

VulnCheck

References

3 references

URL	Tags
https://joshua.hu/cjson-json-parser-cve-vulnerabilities	exploit
https://github.com/DaveGamble/cJSON/blob/v1.7.19/…	technical-description
https://www.vulncheck.com/advisories/cjson-cjson-…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
DaveGamble	cJSON	Affected: 0 , ≤ 1.7.19 (semver)

Date Public

2026-07-25 00:00

Show details on NVD website

JSON

To clipboard

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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-407",
              "description": "Inefficient Algorithmic Complexity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-29T16:00:06.548Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "Security vulnerabilities in the cJSON JSON parser (Joshua Rogers)",
          "tags": [
            "exploit"
          ],
          "url": "https://joshua.hu/cjson-json-parser-cve-vulnerabilities"
        },
        {
          "name": "cJSON_Compare double-recursion object comparison (cJSON.c)",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L3057-L3180"
        },
        {
          "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"
        }
      ],
      "title": "cJSON cJSON_Compare Exponential Complexity Denial of Service",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-67216",
    "datePublished": "2026-07-29T13:32:03.696Z",
    "dateReserved": "2026-07-28T19:20:19.157Z",
    "dateUpdated": "2026-07-30T15:19:59.613Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

ubuntu-cve-2026-67216

Vulnerability from osv_ubuntu

CVE-2026-67216 (GCVE-0-2026-67216)

Tags

Sightings

Nomenclature