CVE-2026-81521Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver
Updated under an hour ago ()
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It affects MongoDB GO Driver. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-99
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB GO Driver mongodb:go_driver (from the name) | from 2.1.0 before 2.8.2; from 2.9.0 before 2.9.2 | CNA record |
mongodb go_driver mongodb:go_driver | from 2.1.0 before 2.8.2 | NVD |
References
- https://jira.mongodb.org/browse/GODRIVER-4075vendor-advisory
- https://pkg.go.dev/go.mongodb.org/mongo-driver/v2@v2.8.2product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.