CVE-2026-126817

Mongoid stores encrypted fields in plaintext when two models share a collection

Published Nov 13, 2026 CVSS 4.0 · 6 Medium EPSS n/a KEV · Not listed

Description

A flaw in the automatic client-side encryption schema generation of the Mongoid ODM may cause values that an application declared for encryption to be written and stored as cleartext when more than one model is mapped onto the same storage location. No error or warning is raised. A party holding an ordinary read-only database account, with no access to the encryption key material, may then obtain those values in clear form.

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 Present

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 flaw in the automatic client-side encryption schema generation of the Mongoid ODM may cause values that an application declared for encryption to be written and stored as cleartext when more than one model is mapped onto the same storage location. No error or warning is raised. A party holding an ordinary read-only database account, with no access to the encryption key material, may then obtain those values in clear form.
Title		Mongoid stores encrypted fields in plaintext when two models share a collection
Weaknesses		CWE-312
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': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}`