Description
The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.
Published: 2026-11-03
Score: 7.1 High
EPSS: n/a
KEV: No
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Remediation

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History

Tue, 03 Nov 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 03 Nov 2026 19:00:00 +0000

Type Values Removed Values Added
Description The MongoDB C Driver does not validate the type or format of a namespace field returned by the server in a query response. A MongoDB endpoint that a client application connects to, without needing any credentials, can return a malformed value in that field. This causes the client application process to terminate, and can also cause the driver to read memory outside an allocated buffer and to send a small amount of the application's own uninitialized heap memory back to the endpoint in a follow-up command. The impact is limited to the process that embeds the driver.
Title remote abort and memory disclosure from a malformed cursor.ns
Weaknesses CWE-617
References
Metrics cvssV3_1

{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-11-03T20:01:51.405Z

Reserved: 2026-11-03T03:27:26.663Z

Link: CVE-2026-120956

cve-icon Vulnrichment

Updated: 2026-11-03T20:01:45.816Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-03T19:18:00.837

Modified: 2026-11-03T20:18:12.830

Link: CVE-2026-120956

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses