CVE-2026-82052: CWE-617 Reachable assertion in MongoDB MongoDB Server
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.
CVSS v4.0
Score 7.1high
Affected software
MongoDB
MongoDB Server
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-82052) involves a reachable assertion failure (CWE-617) in MongoDB Server triggered by the $regexFindAll expression. An authenticated user able to run aggregation pipeline stages can craft a regex that starts matching in the middle of a multi-code-unit character, causing an assertion failure and crashing the mongod process. The flaw affects MongoDB Server versions >=7.0 <7.0.41, >=8.0 <8.0.30, and >=8.3.0 <8.3.9. The CVSS 4.0 base score is 7.1, indicating high severity. There are no known exploits in the wild and no vendor patch links were provided in the input data.
Potential Impact
An attacker with authenticated access and permission to run aggregation pipeline stages can cause a denial of service by crashing the MongoDB server process. This disrupts availability but does not indicate direct data compromise or privilege escalation from the provided information.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is confirmed, restrict access to aggregation pipeline execution to trusted users only to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-27T22:50:28.074Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa03a23acd9273b49ec35f4
Added to database: 09/08/2026, 16:38:59 UTC
Last enriched: 09/16/2026, 01:36:06 UTC
Last updated: 10/21/2026, 13:20:24 UTC
Views: 62
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