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

Quick assessment

Affected
MongoDB Inc. Mongoid
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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-supplie

CVSS 7.5 · High

Affected Version Matrix 9

VendorProduct Version RangeStatus
MongoDB Inc. Mongoid 7.2.0≤ 7.2.6 affected
7.3.0≤ 7.3.5 affected
7.4.0≤ 7.4.3 affected
7.5.0≤ 7.5.4 affected
7.6.0≤ 7.6.1 affected
8.0.0≤ 8.0.12 affected
8.1.0≤ 8.1.12 affected
9.0.0≤ 9.0.11 affected
… +1 more rows
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I. Basic Information for CVE-2026-93761

Vulnerability Information
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Vulnerability Title
Denial of service via unbounded regex matching in Mongoid's in-memory query matcher
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MongoDB Inc. Mongoid 7.2.0 ~ 7.2.6 -

II. Public POCs for CVE-2026-93761

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III. Intelligence Information for CVE-2026-93761

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Other References for CVE-2026-93761 (1)

Same Patch Batch · MongoDB Inc. · 2026-09-18 · 8 CVEs total

CVE-2026-93762 9.8 CRITICAL Data deletion and attribute disclosure via field-name method injection in in-memory querie
CVE-2026-93765 9.1 CRITICAL Document deletion and process crash via unvalidated method-name dispatch in atomic pop ope
CVE-2026-93759 8.6 HIGH Server-side JavaScript injection via string query criteria bypassing the strict operator a
CVE-2026-93760 8.2 HIGH NoSQL injection of JavaScript-executing query operators via unsafe-by-default operator gua
CVE-2026-93758 8.1 HIGH Cross-principal document update, theft, and deletion via unvalidated id in nested attribut
CVE-2026-93763 6.5 MEDIUM Silent plaintext persistence via unresolved callable database name in encryption schema ma
CVE-2026-93764 6.5 MEDIUM Plaintext storage of encrypted fields via skipped embedded models in encryption schema gen

IV. Related Vulnerabilities

Same product: Mongoid
Same vendor: MongoDB Inc.
Same weakness: CWE-1333

V. Comments for CVE-2026-93761

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