Vulnerability-Lookup

ubuntu-cve-2026-81521

Vulnerability from osv_ubuntu

Published

2026-08-31 00:00

Modified

2026-08-31 00:00

Summary

Details

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Severity

6.5 (Medium)


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

7.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-81521	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-81521	REPORT
	https://jira.mongodb.org/browse/GODRIVER-4075	REPORT
	https://pkg.go.dev/go.mongodb.org/mongo-driver/v2…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-mongodb-mongo-driver-dev",
            "binary_version": "1.12.1+ds1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "golang-mongodb-mongo-driver",
        "purl": "pkg:deb/ubuntu/golang-mongodb-mongo-driver@1.12.1+ds1-2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.4+ds1-1ubuntu1",
        "1.12.1+ds1-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-mongodb-mongo-driver-dev",
            "binary_version": "1.17.1+ds1-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "golang-mongodb-mongo-driver",
        "purl": "pkg:deb/ubuntu/golang-mongodb-mongo-driver@1.17.1+ds1-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.17.1+ds1-2"
      ]
    }
  ],
  "aliases": [],
  "details": "The MongoDB Go Driver\u0027s client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.",
  "id": "UBUNTU-CVE-2026-81521",
  "modified": "2026-08-31T00:00:00Z",
  "published": "2026-08-31T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-81521"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-81521"
    },
    {
      "type": "REPORT",
      "url": "https://jira.mongodb.org/browse/GODRIVER-4075"
    },
    {
      "type": "REPORT",
      "url": "https://pkg.go.dev/go.mongodb.org/mongo-driver/v2@v2.8.2"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-81521"
  ]
}

CVE-2026-81521 (GCVE-0-2026-81521)

Vulnerability from cvelistv5 – Published: 2026-08-27 18:31 – Updated: 2026-08-28 15:52

Title

Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver

Summary

Severity

7.1 (High)


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

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-28 15:52 UTC

CWE

CWE-99 - Improper Control of Resource Identifiers ('Resource Injection')

Assigner

mongodb mitre root

References

2 references

URL	Tags
https://jira.mongodb.org/browse/GODRIVER-4075
https://pkg.go.dev/go.mongodb.org/mongo-driver/v2…

Impacted products

1 product

Vendor	Product	Version
MongoDB	GO Driver	Affected: 2.1.0 , < 2.8.2 (semver)

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
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            "other": {
              "content": {
                "id": "CVE-2026-81521",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-28T15:52:01.062590Z",
                "version": "2.0.3"
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      "metrics": [
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      },
      "references": [
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          "url": "https://jira.mongodb.org/browse/GODRIVER-4075"
        },
        {
          "url": "https://pkg.go.dev/go.mongodb.org/mongo-driver/v2@v2.8.2"
        }
      ],
      "source": {
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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.

Action not permitted

ubuntu-cve-2026-81521

Vulnerability from osv_ubuntu

CVE-2026-81521 (GCVE-0-2026-81521)

Tags

Sightings

Nomenclature