CVE-2026-82052
$regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 chars
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-617 |
| Vendor | mongodb |
| Product | mongodb server |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 8, 2026 |
| Last Updated | Sep 10, 2026 |
Stay Ahead of the Next One
Get instant alerts for mongodb mongodb server
Be the first to know when new medium vulnerabilities affecting mongodb mongodb server are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
MongoDB / MongoDB Server
8.3.0 < 8.3.9 8.0 < 8.0.30 7.0 < 7.0.41