CVE-2026-82052 is a vulnerability in MongoDB
Published on September 8, 2026
$regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 chars
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.
Vulnerability Analysis
CVE-2026-82052 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an assertion failure Vulnerability?
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
CVE-2026-82052 has been classified to as an assertion failure vulnerability or weakness.
Products Associated with CVE-2026-82052
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Affected Versions
MongoDB Server:- Version 8.3.0 and below 8.3.9 is affected.
- Version 8.0 and below 8.0.30 is affected.
- Version 7.0 and below 7.0.41 is affected.