Mongodb Server vulnerabilities

CVE-2026-9753 [HIGH] CWE-1287 CVE-2026-9753: The $_internalApplyOplogUpdate aggregation pipeline stage can be used to execute a document diff con 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.

CVE-2026-9742 [HIGH] CWE-1287 CVE-2026-9742: When OIDC authentication is enabled in configuration, clients may set specific values in the "mechan 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.

CVE-2026-9740 [HIGH] CWE-674 CVE-2026-9740: A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash th 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.

CVE-2026-6914 [HIGH] CWE-191 CVE-2026-6914: Computing the MD5 checksum of a malformed BSON object under specific conditions may cause loss of av Computing the MD5 checksum of a malformed BSON object under specific conditions may cause loss of availability in MongoDB server. This issue affects all MongoDB Server v8.2 versions, all MongoDB Server v8.1 versions, MongoDB Server v8.0 versions prior to 8.0.21, MongoDB Server v7.0 versions prior to 7.0.32

CVE-2026-9750 [MEDIUM] CWE-617 CVE-2026-9750: An authenticated user can cause a MongoDB server to crash or return incorrect results by creating do 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.

CVE-2026-9749 [MEDIUM] CWE-617 CVE-2026-9749: This issue can occur when running an aggregation pipeline that uses the internal $exchange stage con 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-con

CVE-2026-9746 [MEDIUM] CWE-617 CVE-2026-9746: When using $changestreams and $_requestReshardingResumeToken with the exchange option the server hit 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.

CVE-2026-9748 [MEDIUM] CWE-617 CVE-2026-9748: The $_internalConvertBucketIndexStats stage used PauseExecution as a way to signal "skip this docume 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, T

CVE-2026-9752 [MEDIUM] CWE-476 CVE-2026-9752: An authorized user could trigger a server crash by running a query with a 2dsphere index on a field 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 u

CVE-2026-9741 [MEDIUM] CWE-319 CVE-2026-9741: A bug in query analysis processing of the $vectorSearch aggregation stage for Queryable Encryption ( 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.

CVE-2026-9743 [MEDIUM] CWE-476 CVE-2026-9743: In MongoDB Server 8.0, an aggregation stage can leave its _subPipeline field null during processing 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 authent

CVE-2026-9747 [MEDIUM] CWE-617 CVE-2026-9747: Adding fromRouter:true and runtimeConstants.userRoles could cause aggregations to crash mongodb serv Adding fromRouter:true and runtimeConstants.userRoles could cause aggregations to crash mongodb server.

CVE-2026-9735 [MEDIUM] CWE-532 CVE-2026-9735: MongoDB server may log authentication parameters, including credentials, to the server log during SA 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.

CVE-2026-5170 [MEDIUM] CWE-617 CVE-2026-5170: A user with access to the cluster with a limited set of privilege actions can trigger a crash of a m A user with access to the cluster with a limited set of privilege actions can trigger a crash of a mongod process during the limited and unpredictable window when the cluster is being promoted from a replica set to a sharded cluster. This may cause a denial of service by taking down the primary of the replica set. This issue affects MongoDB Server v8

CVE-2026-9751 [MEDIUM] CWE-532 CVE-2026-9751: The ldapQueryPassword parameter, when set through the runtime setParameter command, will log the new The ldapQueryPassword parameter, when set through the runtime setParameter command, will log the new password to the mongod.log file in plain text.

CVE-2026-6915 [MEDIUM] CWE-1284 CVE-2026-6915: An authorization flaw in the user management command could allow an authenticated user to make limit An authorization flaw in the user management command could allow an authenticated user to make limited changes to authentication-related data associated with another user account. This could affect how authentication is performed for the impacted account.