CVE-2026-82052

$regexFindAll may crash mongod server when byte-matching multi-byte UTF-8 chars

State: Published
Severity: 7.1 High
Published: Sep 8, 2026
Updated: Sep 10, 2026
Reserved: Aug 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/AU:Y/R:A	mongodb
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	mongodb

Weaknesses

CWE-617 Reachable assertion

Affected Products

Product	Versions
MongoDB ServerMongoDB	8.3.0 to before 8.3.9Affected 8.0 to before 8.0.30Affected 7.0 to before 7.0.41Affected

References

https://jira.mongodb.org/browse/SERVER-127985

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