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CVE-2026-18697

Improper Input Validation in MongoDB Aggregation Framework Allows Unauthenticated Denial of Service on mongos

An issue in MongoDB Server's aggregation framework could allow an unauthenticated party to cause a mongos (router) process to terminate unexpectedly by submitting a specially formed aggregation command. This could result in a denial of service, disrupting client connections routed through the affected mongos instance.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18696

Improper Authorization in MongoDB applyOps Command Handling Allows Unauthorized DDL Operations on Collections

An issue in MongoDB Server's applyOps command could allow an authenticated user with specific non-default privileges to perform certain data-definition operations, such as dropping or modifying collections, against collections they do not have permission to manipulate. This is due to an inconsistency in how the target collection is determined between the authorization check and the actual operation.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18695

Improper Input Validation in MongoDB Timeseries Query Processing Leads to Denial of Service

An issue in MongoDB Server's handling of certain query predicates against time-series collections with a metaField could allow an authenticated user with write access to cause the server process to terminate unexpectedly, resulting in a denial of service.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18694

Out-of-Bounds Read in MongoDB Geospatial Query Processing Leads to Denial of Service and Potential Memory Disclosure

An issue in MongoDB Server's geospatial query processing could allow an authenticated user with write privileges to cause certain malformed geometry data to be stored and later processed without proper validation. Subsequent queries against this data could then result in the server accessing memory outside its intended bounds. This could result in a server crash (denial of service) and may expose a limited amount of server process memory.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18693

Out-of-Bounds Read/Write in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potential Memory Disclosure

An issue in MongoDB Server's handling of timeseries collections could allow an authenticated user with write privileges to cause an internal data structure to become inconsistent through certain document insertions. A subsequent insert into the affected bucket could then result in the server accessing memory outside its intended bounds, potentially causing a server crash (denial of service), exposure of limited memory contents, or memory corruption.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18692

Use-After-Free in MongoDB Timeseries Bucket Handling Leads to Denial of Service and Potential Remote Code Execution

An issue in MongoDB Server's handling of timeseries bucket lifecycle could allow an authenticated user with write privileges to cause an internal reference to be used after the underlying memory has been freed. Subsequent operations could then result in a server crash or, potentially, execution of unintended code.

CVSS 4.0 · 7.7 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18691

Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure

An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cluster's shared internal credential to be transmitted in a less-protected form, potentially allowing that credential to be recovered. If recovered, the credential could be used to authenticate as the internal superuser to nodes in the deployment.

CVSS 4.0 · 9 Critical EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18690

Improper Authorization in MongoDB Server Allows Unauthorized Actions on System Collections

An issue in MongoDB Server could allow an authenticated user with a limited database-scoped role to perform an action against protected system collections that their assigned privileges should not permit. This could result in critical system collections being dropped and recreated without proper authorization.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18688

Out-of-Bounds Read in MongoDB Aggregation Framework Leads to Denial of Service and Potential Memory Disclosure

An issue in MongoDB Server's aggregation framework could allow an authenticated user to trigger an out-of-bounds memory read by providing a specially formed numeric parameter in a certain aggregation pipeline stage. This could result in a server crash (denial of service) and may potentially expose a limited amount of memory contents.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-18687

Improper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial of Service and Index Corruption

MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges could submit a specially formed request that leads to a server crash or excessive internal writes, resulting in resource exhaustion and corruption of encrypted index data.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Mongodb
Products
Mongodb Mongodb Server
CVE-2026-82076

Integer Overflow in Query Planner Leads to Unbounded Memory Allocation and Denial of Service in MongoDB Server

An integer overflow in the query planning component of MongoDB Server can allow an authenticated user with ordinary database-level read/write privileges to bypass an internal resource limit. Submitting a specially crafted query causes the server to consume memory without bound during query planning, and the resulting exhaustion terminates the server process. This may result in a denial of service affecting all databases served by the affected node.

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