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CVE-2026-84970

Heap over-read or silent misparse via 32-bit truncation of JSON length in BSON JSON parser

A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library. An actor who controls the text that an embedding application hands to the library's public JSON parsing interface, when that text is very large, can cause the library to read memory beyond the supplied buffer and return it to the caller, to silently accept only part of the input as a complete document, or to terminate the process. No MongoDB server, credentials, or non-default configuration is required; the effect is confined to the process that uses the library.

CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
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C\# Driver C\+\+ Driver
CVE-2026-84967

Arbitrary command execution via shell-expanded connection string in Launch MongoDB Shell terminal

A component of the MongoDB extension for Visual Studio Code does not neutralize special characters in a connection string before that value is placed into a command line the extension composes for an integrated terminal. An unauthenticated remote unauthorized-user who persuades a developer to accept a user-supplied connection target, and then to open the extension's shell feature, can place characters of the unauthorized-user’s choosing into that command line. No privileges on the developer's machine are required, but several user actions are. The confirmation the developer sees does not display the supplied text.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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Mongodb
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Mongodb Mongodb For Vs Code
CVE-2026-13071

Server-Side JavaScript Aggregation Expression Memory Safety Issue Leading to Process Termination

An authenticated user with read access can cause the mongod process to be terminated through certain aggregation expressions that execute server-side JavaScript. The issue involves improper memory handling during document processing.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13072

MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption

When compute mode is enabled on a standalone mongod instance, insufficient validation of externally sourced BSON data during aggregation pipeline processing can result in memory corruption, potentially leading to process termination or other unintended behavior. This configuration is non-default and requires explicit enablement at startup.

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13073

MongoDB Aggregation Command Invariant Assertion Failure Leading to Process Termination

An authenticated user with read-only privileges can cause the mongod process to terminate abnormally by issuing a crafted aggregation command, resulting in denial of service for all connected clients until the process is restarted. The issue stems from an internal engine selection inconsistency triggered by a specific combination of aggregation options.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13074

Awaitable Hello Command in Exhaust Mode Unthrottled Response Loop Leading to Denial of Service

An unauthenticated remote client can cause excessive CPU consumption on a MongoDB server by sending a specific combination of parameters to the awaitable hello command in exhaust mode. The server's handling of this combination results in a response loop that bypasses normal throttling, allowing a small number of connections to degrade server availability.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13075

$rankFusion and $scoreFusion Unbounded Memory Allocation During Error Suggestion Generation

An authenticated user can cause the mongod process to be terminated by the operating system under memory pressure via the $rankFusion and $scoreFusion aggregation stages. The issue originates in the server's error-handling path and requires the ability to run aggregation queries.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13076

Aggregation Framework Memory Exhaustion Leading to Process Termination

An authenticated user can cause a {{mongod}} process to be terminated by the operating system under memory pressure by performing a specific data type conversion operation within MongoDB's aggregation framework. The behavior stems from disproportionate memory consumption during this operation, and requires both write access to the database and the ability to run aggregation queries.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13077

Out-of-Bounds Heap Read in BSON CodeWScope Element Parsing via Malformed BSONColumn Data

A missing bounds check in the BSON CodeWScope element accessors allows an attacker to trigger an out-of-bounds heap read via a crafted aggregation pipeline. The vulnerability can be exploited by an authenticated user by generating a malformed BSONColumn data containing a CodeWScope element, bypassing wire-level BSON validation. When the forged element is decompressed, the unchecked size value is used in pointer arithmetic, causing either a server crash or disclosure of adjacent heap memory contents.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13078

Local File Disclosure in MongoDB Server via MozJS Scripting Engine Module Loader

A vulnerability was discovered in MongoDB Server where the server-side MozJS scripting engine unconditionally registered a module loading hook that enables JavaScript calls to read arbitrary files from the host filesystem using the mongod process's privileges. An authenticated user could exploit this through crafted aggregation pipeline commands to read sensitive files accessible to the MongoDB server process.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
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Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13069

Queryable Encryption FLE2 Find Payload Missing Input Validation Leading to Resource Exhaustion

An authenticated user can cause excessive CPU consumption or out-of-memory conditions on a MongoDB server by sending a crafted Queryable Encryption find payload containing an unvalidated field used to control an internal computation loop. The resulting resource exhaustion degrades availability for other operations.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13056

A user with read access can cause a DoS by executing a specifically crafted query to consume a large amount of RAM

Using expressions that generate large arrays it is possible to craft a query that creates very large intermediate objects in memory, causing the server to crash with OOM error.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13059

Improper Validation of Client-Supplied Command Parameters Allowing Role-Based Access Control Bypass

An authenticated user with low privileges may be able to perform unauthorized reads and writes on data protected by role-based query-level access controls, due to insufficient validation of certain client-supplied command parameters. The issue affects find, update, delete, and aggregate commands in non-apiStrict configurations.

CVSS 4.0 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13067

tlsCATrusts Role Restriction Not Enforced via PROXY Protocol v2 on Unix Domain Socket

When PROXY protocol v2 is used on the Unix domain socket path, roles derived from X.509 client certificates may not be validated against the configured tlsCATrusts allow-list. This can result in unintended role assignments following MONGODB-X509 authentication. Affected scenarios require local access to the proxy Unix domain socket and a valid X.509 certificate issued by a trusted certificate authority.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13064

MongoDB $jsonSchema Query Operator Excessive CPU Consumption Leading to Denial of Service

Certain query operations involving deeply nested $jsonSchema constructs can trigger disproportionate CPU consumption in affected MongoDB deployments, potentially leading to resource exhaustion. The resulting CPU-bound operation cannot be interrupted through standard administrative controls.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13063

libmongocrypt Improper Input Validation Leading to Process Termination

An authenticated user with standard read/write privileges can cause the mongod process to terminate due to an out-of-memory condition by sending a crafted aggregation command. MongoDB's libmongocrypt library insufficiently validates payload-supplied values, which can result in an excessively large memory allocation.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13070

Improper Validation of OCSP Response During Outbound TLS Handshake Leading to Process Termination

A MongoDB server initiating an outbound TLS connection may terminate abnormally when processing a malformed OCSP response from a remote peer during the TLS handshake. OCSP stapling validation is enabled by default for outgoing TLS connections. Affected scenarios require the remote peer to hold a certificate issued by the cluster's trusted certificate authority, or for the connection to traverse an untrusted network path.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13068

MongoDB mongos Improper Authorization Check in Cursor Termination Allowing Cross-Database Privilege Misuse

An authenticated user holding cursor termination privileges on one database may incorrectly be permitted to terminate active cursors on a separate database, disrupting ongoing query operations for other users. The behavior stems from an authorization check that does not correctly scope privileges to the appropriate namespace.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13066

Server-Side JavaScript DBPointer BSON Serialization Memory Disclosure

Improper handling of DBPointer objects during BSON serialization in MongoDB's server-side JavaScript engine can result in internal process memory contents being included in data returned to the client. This constitutes an unintended information disclosure affecting deployments that use server-side JavaScript.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-13065

MongoDB $linearFill Window Function Improper Input Validation Leading to Process Termination

A user with read-only privileges is able to craft an aggregation pipeline using the $linearFill window function operator with a specific sortBy expression type to cause the mongod process to terminate abnormally, resulting in denial of service. The issue stems from insufficient validation of sort specifications during execution.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server