Description
A use-after-free in the aggregation framework of MongoDB Server can occur when certain expressions are evaluated in an aggregation sub-pipeline. The condition can be caused by an authenticated user with read privileges, and may result in the server terminating unexpectedly.
Published: 2026-11-10
Score: 7.1 High
EPSS: n/a
KEV: No
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Remediation

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History

Tue, 10 Nov 2026 20:30:00 +0000

Type Values Removed Values Added
Description A use-after-free in the aggregation framework of MongoDB Server can occur when certain expressions are evaluated in an aggregation sub-pipeline. The condition can be caused by an authenticated user with read privileges, and may result in the server terminating unexpectedly.
Title Post-authentication use-after-free in MongoDB Server aggregation sub-pipelines
Weaknesses CWE-416
References
Metrics cvssV3_1

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

cvssV4_0

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

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-11-10T20:17:45.700Z

Reserved: 2026-11-02T22:54:38.779Z

Link: CVE-2026-120821

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-10T21:19:01.090

Modified: 2026-11-10T21:19:01.090

Link: CVE-2026-120821

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses