Answer in brief
CVE-2026-81521 records a High severity (CVSS 7.1) vulnerability in Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver. The current sources do not mark it as known exploited. The current feed maps MongoDB/GO Driver (generic), MongoDB/GO Driver (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps MongoDB/GO Driver (generic), MongoDB/GO Driver (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:mongodb:go_driver:*:*:*:*:*:mongodb:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| MongoDB/GO Drivergeneric | >=2.1.0 <2.8.2 || >=2.9.0 <2.9.2 | 2.8.2, 2.9.2 |
| MongoDB/GO Drivergeneric | >=2.1.0 <2.8.2 | 2.8.2 |
Published upstream
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 27, 2026
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.
Quoted source text, attributed separately from HOL analysis.