What is CVE-2026-82052?

CVE-2026-82052 is a medium-severity vulnerability in MongoDB Server, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-09-08.

How severe is CVE-2026-82052?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in MongoDB Server

CVE-2026-82052

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 v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Mongodb Server

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

cna@mongodb.com

Frequently asked questions

What is CVE-2026-82052?: CVE-2026-82052 is a medium-severity vulnerability in MongoDB Server, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-09-08.
How severe is CVE-2026-82052?: Medium severity. CVSS v3 base score is 6.5 out of 10.