Medium severity · published Sep 8, 2026
CVE-2026-82052
$regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 chars
6.5
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
MongoDB · MongoDB
8.3.0 before 8.3.9; 8.0 before 8.0.30; 7.0 before 7.0.41 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-82052
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-82052
Issue Tracking
https://jira.mongodb.org/browse/SERVER-127985
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