Vulnerability-Lookup

ubuntu-cve-2026-84965

Vulnerability from osv_ubuntu

Published

2026-09-03 16:18

Modified

2026-09-16 11:43

Summary

Details

An integer wraparound in an allocation size calculation in the BSON library's JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.

Severity

5.1 (Medium)


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

5.9 (Medium)


                    
                      CVSS:4.0/AV:L/AC:H/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-2026-84965	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-84965	REPORT
	https://jira.mongodb.org/browse/CDRIVER-6405	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbson-1.0-0",
            "binary_version": "1.16.1-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libmongoc-1.0-0",
            "binary_version": "1.16.1-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "mongo-c-driver",
        "purl": "pkg:deb/ubuntu/mongo-c-driver@1.16.1-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.15.0-1",
        "1.15.1-1",
        "1.15.2-1",
        "1.16.0-1",
        "1.16.1-1",
        "1.16.1-1build1",
        "1.16.1-1build2",
        "1.16.1-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbson-1.0-0",
            "binary_version": "1.21.0-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "libmongoc-1.0-0",
            "binary_version": "1.21.0-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "mongo-c-driver",
        "purl": "pkg:deb/ubuntu/mongo-c-driver@1.21.0-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.18.0-1",
        "1.19.1-1",
        "1.19.2-1",
        "1.20.0-1",
        "1.20.0-1build1",
        "1.20.1-1",
        "1.21.0-1",
        "1.21.0-1build1",
        "1.21.0-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbson-1.0-0t64",
            "binary_version": "1.26.0-1.1ubuntu2+esm1"
          },
          {
            "binary_name": "libmongoc-1.0-0t64",
            "binary_version": "1.26.0-1.1ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "mongo-c-driver",
        "purl": "pkg:deb/ubuntu/mongo-c-driver@1.26.0-1.1ubuntu2+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.24.3-1",
        "1.24.4-1",
        "1.25.1-1",
        "1.25.2-1",
        "1.25.4-1",
        "1.26.0-1",
        "1.26.0-1.1ubuntu1",
        "1.26.0-1.1ubuntu2",
        "1.26.0-1.1ubuntu2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libbson2-2",
            "binary_version": "2.2.2-1"
          },
          {
            "binary_name": "libmongoc2-2",
            "binary_version": "2.2.2-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "mongo-c-driver",
        "purl": "pkg:deb/ubuntu/mongo-c-driver@2.2.2-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.30.4-1ubuntu1",
        "2.2.0-1",
        "2.2.1-1",
        "2.2.2-1"
      ]
    }
  ],
  "aliases": [],
  "details": "An integer wraparound in an allocation size calculation in the BSON library\u0027s JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service.",
  "id": "UBUNTU-CVE-2026-84965",
  "modified": "2026-09-16T11:43:10Z",
  "published": "2026-09-03T16:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-84965"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-84965"
    },
    {
      "type": "REPORT",
      "url": "https://jira.mongodb.org/browse/CDRIVER-6405"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:H/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-2026-84965"
  ]
}

CVE-2026-84965 (GCVE-0-2026-84965)

Vulnerability from cvelistv5 – Published: 2026-09-03 15:01 – Updated: 2026-09-03 15:44

Title

Heap write primitive via size round-up wrap during JSON parsing on 32-bit builds

Summary

Severity

5.9 (Medium)


                        
                          CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

5.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-03 15:43 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

mongodb mitre root

References

1 reference

URL	Tags
https://jira.mongodb.org/browse/CDRIVER-6405

Impacted products

1 product

Vendor	Product	Version
MongoDB	C Driver	Affected: 1.10.0 , < 1.30.9 (semver) Affected: 2.0.0 , < 2.5.2 (semver)

Show details on NVD website

JSON

To clipboard

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  "containers": {
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      {
        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2026-84965",
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                  },
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                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-03T15:43:02.927377Z",
                "version": "2.0.3"
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          "vendor": "MongoDB",
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            },
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              "versionType": "semver"
            }
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            }
          ],
          "value": "An integer wraparound in an allocation size calculation in the BSON library\u0027s JSON parsing code can cause a buffer to be released while a following copy operation still writes through the stale pointer. On builds where sizes are 32 bits, an unauthenticated party able to supply a sufficiently large JSON input to an application that links the library may cause that application to terminate unexpectedly, resulting in denial of service."
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      "metrics": [
        {
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            "Recovery": "NOT_DEFINED",
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            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 5.9,
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            "exploitMaturity": "NOT_DEFINED",
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            "subConfidentialityImpact": "NONE",
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      "references": [
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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.
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.