Description
A BSON encoding component of the MongoDB Java Driver does not verify that an externally supplied raw document's self-declared length agrees with the extent of the byte range it is given before that range is copied into an outgoing database command. An application that wraps untrusted raw bytes in such a document and uses it as part of a command can therefore emit a structurally inconsistent message, causing the database to interpret attacker-supplied trailing content as additional fields of the surrounding command. No authentication to the driver or database is required beyond the ability to influence those bytes through the victim application, and no user interaction is needed. The result is unintended modification of the command actually executed, which can alter the data read or written under the application's credentials.
Published: 2026-10-28
Score: 6.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 28 Oct 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb java Driver
Vendors & Products Mongodb
Mongodb java Driver

Wed, 28 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
Description A BSON encoding component of the MongoDB Java Driver does not verify that an externally supplied raw document's self-declared length agrees with the extent of the byte range it is given before that range is copied into an outgoing database command. An application that wraps untrusted raw bytes in such a document and uses it as part of a command can therefore emit a structurally inconsistent message, causing the database to interpret attacker-supplied trailing content as additional fields of the surrounding command. No authentication to the driver or database is required beyond the ability to influence those bytes through the victim application, and no user interaction is needed. The result is unintended modification of the command actually executed, which can alter the data read or written under the application's credentials.
Title NoSQL injection via mismatched BSON size prefix in raw document splice to the wire protocol
Weaknesses CWE-943
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}


Subscriptions

Mongodb Java Driver
cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-10-28T16:51:21.960Z

Reserved: 2026-10-28T16:00:23.372Z

Link: CVE-2026-118581

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-28T17:18:26.927

Modified: 2026-10-28T17:18:26.927

Link: CVE-2026-118581

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T19:30:14Z

Weaknesses