CVE-2026-125116

What it is

Mongoose is a MongoDB object modeling tool designed to work in an asynchronous environment. Prior to 6.13.12, 7.8.13, 8.24.7, and 9.11.4, Mongoose uses attacker-controlled discriminator key values, including the default __t field, to index plain-object registries such as Model.discriminators and schema.discriminators without requiring an own property. Values such as constructor, toString, or hasOwnProperty can therefore resolve to inherited built-in functions instead of a registered discriminator, causing type confusion in model construction, document creation, hydration, query and update casting, embedded discriminators, and populate operations. In the bulkWrite() insertOne path with skipValidation enabled, a constructor value can cause a raw input object to be stored without schema casting or strict filtering, and a stored poisoned document can make every query that hydrates it fail until the document is removed. The weakness reads inherited properties but does not modify Object.prototype and is not prototype pollution. This issue is fixed in versions 6.13.12, 7.8.13, 8.24.7, and 9.11.4.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-11-09 17:45 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-11-09 22:20 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-11-09 22:20 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: not scored yet.
• Severity: 4.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-11-09 22:20 UTC

Last modified

2026-11-09 22:20 UTC

Weakness

CWE-843

Record status

Received

Affected

• Automattic Mongoose < 6.13.12
• Automattic Mongoose >= 7.0.0, < 7.8.13
• Automattic Mongoose >= 8.0.0, < 8.24.7

Attack profile CVSS 3.1 · 4.8

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-125116.md and follow it. Check whether this project is affected by CVE-2026-125116. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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