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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.

Mongoid 库中内存查询评估组件存在低效的正则表达式复杂度问题，可能允许未经身份验证的攻击者在内嵌应用进程中引发过度的资源处理。如果应用程序将用户提供的文本用于嵌入关联的模式匹配查询条件中，可能会导致应用无响应。

CVSS 7.5 · High EPSS 0.46% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

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