Vulnerability-Lookup

UBUNTU-CVE-2026-67216 (CVE-2026-67216)

Vulnerability from osv_ubuntu – Published: 2026-07-29 14:16 – Updated: 2026-08-06 00:23 – Source website

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.

Severity

5.9 (Medium)


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

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:L/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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
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            "binary_version": "3.0.11-1ubuntu0.1~esm2"
          },
          {
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      },
      "package": {
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        "name": "iperf3",
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      },
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    {
      "ecosystem_specific": {
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      },
      "ranges": [
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      },
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            }
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        "1.7.15-1",
        "1.7.15-1ubuntu0.1~esm2",
        "1.7.15-1ubuntu0.1",
        "1.7.15-1ubuntu0.1+esm1"
      ]
    },
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      "package": {
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      },
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        "3.9-1+deb11u1ubuntu0.1~esm1",
        "3.9-1+deb11u1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
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      },
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        "name": "mapcache",
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      },
      "ranges": [
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      "versions": [
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        "1.14.0-2build1",
        "1.14.0-2build2",
        "1.14.0-4build1",
        "1.14.0-4build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libcjson1",
            "binary_version": "1.7.17-1ubuntu0.1~esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "cjson",
        "purl": "pkg:deb/ubuntu/cjson@1.7.17-1ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
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          "events": [
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          "type": "ECOSYSTEM"
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      "versions": [
        "1.7.16-1",
        "1.7.16-2",
        "1.7.17-1",
        "1.7.17-1ubuntu0.1~esm2",
        "1.7.17-1ubuntu0.1~esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "iperf3",
            "binary_version": "3.16-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libiperf0",
            "binary_version": "3.16-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "iperf3",
        "purl": "pkg:deb/ubuntu/iperf3@3.16-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
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        "3.16-1",
        "3.16-1build1",
        "3.16-1build2",
        "3.16-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libcjson1",
            "binary_version": "1.7.19-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "cjson",
        "purl": "pkg:deb/ubuntu/cjson@1.7.19-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
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          "type": "ECOSYSTEM"
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      ],
      "versions": [
        "1.7.18-3.1",
        "1.7.18-4",
        "1.7.19-1",
        "1.7.19-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "iperf3",
            "binary_version": "3.20-2"
          },
          {
            "binary_name": "libiperf0",
            "binary_version": "3.20-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "iperf3",
        "purl": "pkg:deb/ubuntu/iperf3@3.20-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
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          "type": "ECOSYSTEM"
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        "3.18-2",
        "3.19.1-2",
        "3.20-2"
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    },
    {
      "ecosystem_specific": {
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            "binary_version": "1.14.1-3build2"
          },
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            "binary_name": "libmapcache1t64",
            "binary_version": "1.14.1-3build2"
          },
          {
            "binary_name": "mapcache-cgi",
            "binary_version": "1.14.1-3build2"
          },
          {
            "binary_name": "mapcache-tools",
            "binary_version": "1.14.1-3build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "mapcache",
        "purl": "pkg:deb/ubuntu/mapcache@1.14.1-3build2?arch=source\u0026distro=resolute"
      },
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          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14.1-3",
        "1.14.1-3build1",
        "1.14.1-3build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "sail-ocaml",
            "binary_version": "0.19.1+dfsg5-1build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "sail-ocaml",
        "purl": "pkg:deb/ubuntu/sail-ocaml@0.19.1+dfsg5-1build3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.19.1+dfsg5-1",
        "0.19.1+dfsg5-1build2",
        "0.19.1+dfsg5-1build3"
      ]
    }
  ],
  "aliases": [],
  "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": "UBUNTU-CVE-2026-67216",
  "modified": "2026-08-06T00:23:22Z",
  "published": "2026-07-29T14:16:00Z",
  "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:3.1/AV:N/AC:L/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

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-07-30 13:38 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

VulnCheck mitre root

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) cpe:2.3:a:davegamble:cjson::::::::

Date Public

2026-07-25 00:00

Show details on NVD website

JSON

To clipboard

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        {
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "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.

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2026-67216 (CVE-2026-67216)

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

Tags

Sightings

Nomenclature

Related by attack behaviour