# CVE-2026-93761: Denial of service via unbounded regex matching in Mongoid's in-memory query matcher

> CVE-2026-93761: Denial of service via unbounded regex matching in Mongoid's in-memory query matcher. CVSS 7.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-93761
Last updated: 2026-09-24T16:06:04Z

- Published: 2026-09-18 17:20 UTC · Updated: 2026-09-24 16:06 UTC · Assigner: mongodb
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 0.46%, 40th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-1333

## 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.

## Affected vendors and products

- MongoDB Inc.: Mongoid

## Tracked companies

- [MongoDB Atlas](https://rewindex.com/company/mongodb-atlas.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-93761)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-93761)
- [https://jira.mongodb.org/browse/MONGOID-5981](https://jira.mongodb.org/browse/MONGOID-5981)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-93761 · Markdown: https://rewindex.com/cve/CVE-2026-93761.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-93761 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:44.166Z