What’s Vulnerable › Vulnerabilities
CVE-2026-93761: Denial of service via unbounded regex matching in Mongoid's in-memory query matcher
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-18 · updated 2026-09-24
- Weakness: 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 products
- MongoDB Inc. Mongoid: from 8.0.0 before 8.0.13; from 8.1.0 before 8.1.13; from 9.0.0 before 9.0.12; 9.1.0 — fixed in 8.0.13, 8.1.13, 9.0.12
How to fix
Upgrade to a fixed version: MongoDB Inc. Mongoid 8.0.13, 8.1.13, 9.0.12. Check the vendor advisory for mitigations.
References
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