CVE-2026-126818

Mongoid 9.1.1 incomplete CVE-2026-93764 fix stores descendant-only encrypted fields in plaintext

Published Nov 13, 2026 CVSS 4.0 · 7.1 High EPSS n/a KEV · Not listed

Description

A Ruby object-document mapper does not apply its automatic field-level encryption configuration to certain fields when the data model uses class inheritance. Values the application designated for encryption are written to the database in readable form without any error or warning. A database account holding only read access to the application's collections, and no access to the encryption key store, may obtain those values.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

MongoDB

Ruby Driver

unaffected

Version	Status	Constraints
`9.0.0`	affected	—
`9.0.1`	affected	—
`9.0.2`	affected	—
`9.0.3`	affected	—
`9.0.4`	affected	—
`9.0.5`	affected	—
`9.0.6`	affected	—
`9.0.7`	affected	—
`9.0.8`	affected	—
`9.0.9`	affected	—
`9.0.10`	affected	—
`9.0.11`	affected	—
`9.0.12`	affected	—
`9.1.0`	affected	—
`9.1.1`	affected	—

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://jira.mongodb.org/browse/MONGOID-6037

History

Nov 13, 2026 3:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A Ruby object-document mapper does not apply its automatic field-level encryption configuration to certain fields when the data model uses class inheritance. Values the application designated for encryption are written to the database in readable form without any error or warning. A database account holding only read access to the application's collections, and no access to the encryption key store, may obtain those values.
Title		Mongoid 9.1.1 incomplete CVE-2026-93764 fix stores descendant-only encrypted fields in plaintext
Weaknesses		CWE-311
References		https://jira.mongodb.org/browse/MONGOID-6037
Metrics		cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}` cvssV4_0 `{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`