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Vulnerability · Published May 12, 2026 · Assigned by mongodb

CVE-2026-8053FlatBSON Duplicate Field Index Drift

High 8.8

In plain English

A high-severity out-of-bounds write in MongoDB Server from MongoDB, Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 48.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

An issue in MongoDB Server's time-series collection implementation allows an authenticated user with database write privileges to trigger an out-of-bounds memory write in the mongod process. The issue results from an inconsistency in the internal field-name-to-index mapping within the time-series bucket catalog. Under certain conditions this can result in arbitrary code execution. This issue impacts MongoDB Server v5.0 versions prior to 5.0.33, v6.0 versions prior to 6.0.28, v7.0 versions prior to 7.0.34, v8.0 versions prior to 8.0.23, v8.2 versions prior to 8.2.9 and v8.3 versions prior to 8.3.2.

Affected products (as reported)

VendorProductVersions
MongoDB, Inc. MongoDB Server 5.0 – before 5.0.336.0 – before 6.0.287.0 – before 7.0.348.0 – before 8.0.238.2 – before 8.2.98.3 – before 8.3.2

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References