CVE-2026-93761

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

HIGH
7.5
CVSS Score
Published: September 18, 2026 at 05:20 PM UTC
Updated: September 24, 2026 at 04:27 PM UTC
1 product affected across 1 vendorMongoid

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

7.2.0 ≤ v ≤ 7.2.67.3.0 ≤ v ≤ 7.3.57.4.0 ≤ v ≤ 7.4.37.5.0 ≤ v ≤ 7.5.47.6.0 ≤ v ≤ 7.6.18.0.0 ≤ v ≤ 8.0.128.0.0 ≤ v < 8.0.138.1.0 ≤ v ≤ 8.1.128.1.0 ≤ v < 8.1.139.0.0 ≤ v ≤ 9.0.119.0.0 ≤ v < 9.0.127.2.07.3.07.4.07.5.07.6.08.0.08.1.09.0.09.1.0
Affected range stops below 8.0.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Permissions Required
Source: cverecord
https://jira.mongodb.org/browse/MONGOID-5981

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHmongodb
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-1333

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