CVE-2026-81521

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Source
https://cve.org/CVERecord?id=CVE-2026-81521
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-81521.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-81521
Downstream
DEBIAN (1)
openSUSE (2)
RHSA (1)
SUSE (2)
UBUNTU (1)
Related
openSUSE (2)
SUSE (2)
Published
2026-08-27T18:31:45Z
Modified
2026-10-24T10:36:21Z
Severity
  • 7.1 (High) CVSS_V4 - 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 CVSS Calculator
Summary
Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver
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.

Database specific 
{
    "cna_assigner": "mongodb",
    "cwe_ids": [
        "CWE-99"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81521.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "range": [
                        {
                            "introduced": "2.1.0"
                        },
                        {
                            "fixed": "2.8.2"
                        },
                        {
                            "introduced": "2.9.0"
                        },
                        {
                            "fixed": "2.9.2"
                        }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/mongodb/mongo-go-driver

Affected ranges

Type
GIT
Repo
https://github.com/mongodb/mongo-go-driver
Events
Introduced
5afecc5d27e39384dd89ccacde921025cb74d7f1
Fixed
1af6d00dbeb70805a69cc9f8fc0828e1f4cef1ee
Database specific
Show details 
{
    "extracted_events": [
        {
            "cpe": "cpe:2.3:a:mongodb:go_driver:*:*:*:*:*:mongodb:*:*",
            "range": [
                {
                    "introduced": "2.1.0"
                },
                {
                    "fixed": "2.8.2"
                }
            ],
            "source": "CPE_RANGE"
        }
    ]
}

Affected versions

v2.*
v2.1.0
v2.2.0
v2.3.0
v2.4.0
v2.5.0
v2.6.0
v2.8.0
v2.8.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-81521.json"