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-2026-9735

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-2026-9740

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-2026-9748

$_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

CVE-2026-9743

Aggregation sub-pipeline null dereference may allow DoS via crafted getMore

In MongoDB Server 8.0, an aggregation stage can leave its _subPipeline field null during processing of certain pipelines. If a getMore is subsequently issued on the same cursor, the server may dereference this null sub-pipeline when reattaching to the operation context, accessing an invalid address and crashing the process. This issue allows an authenticated user who can run aggregation pipelines to cause a denial of service by issuing a specially crafted aggregation followed by getMore on affected versions.

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

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9751

Sensitive data could be written to mongod.log

The ldapQueryPassword parameter, when set through the runtime setParameter command, will log the new password to the mongod.log file in plain text.

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

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9752

GeometryCollection with strict-winding polygon causes server crash during 2dsphere index key generation

An authorized user could trigger a server crash by running a query with a 2dsphere index on a field that stores a GeoJSON GeometryCollection containing a Polygon with a strict-winding CRS. Strict-winding polygons are intentionally unsupported for indexing, but the guard that rejects them does not inspect members of a GeometryCollection, allowing the unsafe path to be reached which ends with an ensuing null-pointer dereference.

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

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9753

Server crash via malformed binary diff passed to $_internalApplyOplogUpdate.

The $_internalApplyOplogUpdate aggregation pipeline stage can be used to execute a document diff containing a malformed binary diff to return memory out-of-bounds or crash the server. $_internalApplyOplogUpdate can be executed by any authenticated user with access to the aggregate command.

CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9749

Using MaxKey() may crash the server

This issue can occur when running an aggregation pipeline that uses the internal $exchange stage configured with key-range partitioning and order-preserving delivery. If a single key range produces enough documents to fill its exchange buffer (that is, many results are routed to the same consumer), the server reaches the code path where a full per-consumer buffer is detected but the internal "high watermark" for that key range is not updated as intended.

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

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9746

Server crashes in case of the use of exchange

When using $changestreams and $_requestReshardingResumeToken with the exchange option the server hits an invariant which causes the server to crash. There are no special privileges needed. The user must be logged in to issue the statement.

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

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9742

Authenticate command with specific mechanism parameter can trigger server crash

When OIDC authentication is enabled in configuration, clients may set specific values in the "mechanism" parameter of the "authenticate" command that lead to server crash. The authenticate command is accessible to unauthenticated clients, leading to pre-auth denial-of-service in affected product configurations.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed

Vendors

Mongodb

Products

Mongodb Mongodb Server

CVE-2026-9741

Client side encryption fails to encrypt values in a $vectorSearch

A bug in query analysis processing of the $vectorSearch aggregation stage for Queryable Encryption (QE) or Client-Side Field Level Encryption (CSFLE) results in literal values for encrypted fields within the $vectorSearch stage filter expressions to be sent to the server as plaintext instead of ciphertext.

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

Vendors

Mongodb

Products

Mongodb Mongodb Server