CVE-2026-93761

Denial of service via unbounded regex matching in Mongoid's in-memory query matcher

State: Published
Severity: 8.7 High
Published: Sep 18, 2026
Updated: Sep 19, 2026
Reserved: Sep 18, 2026

Description

An inefficient regular expression complexity issue in the in-memory query evaluation component of the Mongoid library may allow an unauthenticated party to cause excessive processing within an embedding application process. Applications that place user-supplied text into a pattern-matching query condition on an embedded association may become unresponsive.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	mongodb

Weaknesses

CWE-1333 Inefficient Regular Expression Complexity

Affected Products

Product	Versions
MongoidMongoDB Inc.	7.2.0 through 7.2.6Affected 7.3.0 through 7.3.5Affected 7.4.0 through 7.4.3Affected 7.5.0 through 7.5.4Affected 7.6.0 through 7.6.1Affected 8.0.0 through 8.0.12Affected 8.1.0 through 8.1.12Affected 9.0.0 through 9.0.11Affected 9.1.0Affected

References

https://jira.mongodb.org/browse/MONGOID-5981

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