The $regexFindAll expression can be used by an authenticated user who can run aggregation pipeline stages to crash a MongoDB server (mongod). Under certain specific conditions the  regex match can start in the middle of a multi-code-unit character, triggering an assertion during query execution.
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Fixes

Solution

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Workaround

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History

Tue, 08 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Mongodb
Mongodb mongodb Server
Vendors & Products Mongodb
Mongodb mongodb Server
Metrics ssvc

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


Tue, 08 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description The $regexFindAll expression can be used by an authenticated user who can run aggregation pipeline stages to crash a MongoDB server (mongod). Under certain specific conditions the  regex match can start in the middle of a multi-code-unit character, triggering an assertion during query execution.
Title $regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 chars
Weaknesses CWE-617
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/AU:Y/R:A'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-09-08T17:55:31.610Z

Reserved: 2026-08-27T22:50:28.074Z

Link: CVE-2026-82052

cve-icon Vulnrichment

Updated: 2026-09-08T17:55:28.390Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-08T17:18:32.987

Modified: 2026-09-08T19:07:12.210

Link: CVE-2026-82052

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-08T18:30:04Z

Weaknesses