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

CVE-2026-13061

Improper Access Control Allowing Cross-User Session Metadata Disclosure in $listSessions Aggregation Stage

An authenticated user may be able to view session metadata belonging to other users on the system through the $listSessions aggregation stage. This information is normally restricted to users with cluster-level administrative privileges, and includes active session identifiers, associated usernames, and activity timestamps.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-13055

Server crash via aggregation pipeline expression with compound wildcard index specification

The `$_internalIndexKey` aggregation expression can be used by any authenticated user to crash a MongoDB server (mongod). The expression fails to handle compound wildcard index specifications, triggering an internal consistency check that aborts the server process. The user must be able to run an aggregation pipeline.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-13057

Authorization Bypass via Client-Supplied $search.mergingPipeline Leaks Unauthorized Collection Data Through $$SEARCH_META

An issue in the server’s Atlas Search integration allows an authenticated user to bypass per-user access controls. In sharded topologies, the $search and $searchMeta aggregation stages use internal routing that is normally populated only by the trusted router during sharded search planning. Due to insufficient input validation, an authenticated client can supply these fields directly.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-13058

Transaction Command Insufficient Input Validation Leading to Process Termination

An authenticated user with basic write privileges can cause the mongod process to terminate abnormally by sending a crafted transaction command with an incomplete set of required fields. The issue stems from inconsistent validation across related transaction command parameters, resulting in a fatal internal invariant failure and denial of service.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9754

Stack memory disclosure in filemd5 command

An authenticated user with the read role may read limited amounts of uninitialized stack memory via specially-crafted issuances of the filemd5 command

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb

CVE-2026-9740

Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow

A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash the mongod process by sending a specially crafted message. The BSON validator's handling of certain nested binary data structures permits uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9735

Keyfile contents are in MongoDB Server logs

MongoDB server may log authentication parameters, including credentials, to the server log during SASL authentication. When connection health metric logging is enabled, the full authentication parameters are written to the log without redaction.

CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9748

$_internalConvertBucketIndexStats may crash the mongod server when working on no timeseries input

The $_internalConvertBucketIndexStats stage used PauseExecution as a way to signal "skip this document" when an index stats conversion failed. But PauseExecution is not a general purpose skip mechanism, but rather a TeeBuffer-internal signal used solely by $facet to coordinate its sub-pipelines. When this stage is placed before $facet in a pipeline, TeeBuffer receives the unexpected PauseExecution from upstream and hits a hard invariant assertion, crashing mongod.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9750

Metadata name collision on $-prefixed fields causes post-auth server crash

An authenticated user can cause a MongoDB server to crash or return incorrect results by creating documents that interfere with internal metadata processing during query execution. This stems from insufficient separation between user-controlled document fields and internal metadata in certain execution paths.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9747

Crafted cross-shard merge aggregation crashes MongoDB Server

Adding fromRouter:true and runtimeConstants.userRoles could cause aggregations to crash mongodb server.

CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server