MongoDB Server up to 8.1.0 Field _id type confusion

Summaryinfo

A vulnerability was found in MongoDB Server up to 8.1.0. It has been classified as problematic. The impacted element is an unknown function of the component Field Handler. Performing a manipulation of the argument _id results in type confusion. This vulnerability is identified as CVE-2025-7259. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in MongoDB Server up to 8.1.0. This affects an unknown code block of the component Field Handler. The manipulation of the argument _id with an unknown input leads to a type confusion vulnerability. CWE is classifying the issue as CWE-843. The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. This is going to have an impact on availability. The summary by CVE is:

An authorized user can issue queries with duplicate _id fields, that leads to unexpected behavior in MongoDB Server, which may result to crash. This issue can only be triggered by authorized users and cause Denial of Service. This issue affects MongoDB Server v8.1 version 8.1.0.

The advisory is shared at jira.mongodb.org. This vulnerability is uniquely identified as CVE-2025-7259 since 07/07/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/03/2025).

The vulnerability scanner Nessus provides a plugin with the ID 242978 (MongoDB 8.1.x < 8.1.1 / 8.2.0 DoS (SERVER-102693)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (242978). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Database Software

Vendor

• MongoDB

Name

• Server

Version

• 8.0
• 8.1.0

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion