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VULNERABILITIES

CVE-2026-9749 Details

Description

This issue can occur when running an aggregation pipeline that uses the internal $exchange stage configured with key-range partitioning and order-preserving delivery. If a single key range produces enough documents to fill its exchange buffer (that is, many results are routed to the same consumer), the server reaches the code path where a full per-consumer buffer is detected but the internal "high watermark" for that key range is not updated as intended.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://jira.mongodb.org/browse/SERVER-124031 [email protected]PatchVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-617Reachable Assertion[email protected]

Affected Products

ProductVersions
mongodb mongodb
>= 7.0.0, < 7.0.35
>= 8.0.0, < 8.0.24
>= 8.2.0, < 8.2.10
>= 8.3.0, < 8.3.3

CPE

  • cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-9749
NVD Published Date:
Jun 9, 2026
NVD Last Modified:
Jul 23, 2026
Source:
[email protected]
CVE-2026-9749 Details - Not Deferred