CVE-2026-81521CWE-99

CVE-2026-81521

Medium · published August 28, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
10.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0
7.1 · 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
EPSS
0.00203 · 10.3th percentile
Weakness
CWE-99 · Improper Control of Resource Identifiers ('Resource Injection')
Published
2026-08-28T00:18Z
References (2)
https://jira.mongodb.org/browse/GODRIVER-4075 · [email protected]https://pkg.go.dev/go.mongodb.org/mongo-driver/[email protected] · [email protected]
EPSS history
Timeline
  • 27 AUG 18:31Z
    Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver
    cvelistv5