MongoDB Server: Thirteen Vulnerabilities Disclosed in Single Batch
Thirteen MongoDB Server vulnerabilities, ranging from Medium to High severity, were disclosed together on August 11, 2026, impacting query processing, data integrity, and server stability.
Key findings
- Thirteen MongoDB Server vulnerabilities disclosed on August 11, 2026, ranging from Medium to High severity.
- Several High severity flaws pose risks of server crashes, memory corruption, and potential code execution.
- Vulnerabilities impact authenticated users, with some allowing privilege escalation or unauthorized data manipulation.
- Denial-of-service conditions can be triggered through crafted queries, aggregation commands, or malformed data.
- Issues affect various components including query execution, aggregation framework, time-series collections, and geospatial processing.
- Coordinated disclosure of all thirteen CVEs on the same date suggests a single, significant security event.
On August 11, 2026, a significant batch of thirteen vulnerabilities was disclosed for MongoDB Server, impacting various components and functionalities of the database system. These vulnerabilities, all disclosed simultaneously, range in severity from Medium to High, with several carrying CVSS scores that warrant immediate attention from administrators. The disclosures highlight potential risks including server crashes, denial-of-service conditions, unauthorized data access, and memory corruption issues, underscoring the need for prompt patching and security review.
Several vulnerabilities stem from issues within MongoDB's query processing and aggregation frameworks. CVE-2026-18711, a High severity flaw, involves memory corruption in the query execution engine for time-series collections, potentially leading to server crashes or data disclosure. Similarly, CVE-2026-18692, another High severity vulnerability, concerns the handling of timeseries bucket lifecycles, which could result in server crashes or unintended code execution due to memory being used after it has been freed. CVE-2026-18688, also High severity, arises from an out-of-bounds memory read triggered by a specially formed numeric parameter in an aggregation pipeline stage, leading to a denial of service and potential data exposure. CVE-2026-18697, a High severity flaw, allows an unauthenticated party to cause a mongos router process to terminate unexpectedly via a crafted aggregation command, disrupting client connections.
Other vulnerabilities focus on privilege escalation and unauthorized data manipulation. CVE-2026-18690, a High severity issue, permits an authenticated user with limited database-scoped roles to perform actions against protected system collections that should require higher privileges, potentially leading to the dropping and recreation of critical collections without authorization. CVE-2026-18696, a Medium severity flaw, allows authenticated users with specific non-default privileges to execute data-definition operations, like dropping collections, on resources they shouldn't have access to. CVE-2026-18695, also Medium severity, enables authenticated users with write access to cause server termination when handling certain time-series collections with a metaField.
Denial-of-service vulnerabilities are also prominent in this batch. CVE-2026-18701, a Medium severity flaw, allows an authenticated user with read privileges to terminate the server process by submitting a specially formed query filter. CVE-2026-18694, a High severity vulnerability, involves the storage and processing of malformed geometry data in geospatial queries, which can lead to memory access outside intended boundaries after subsequent queries. CVE-2026-18687, another High severity issue, arises from improper validation of request parameters during Queryable Encryption maintenance operations, potentially causing server crashes or excessive memory usage.
Furthermore, security configuration and metadata access are affected. CVE-2026-18702, a Medium severity vulnerability, allows authenticated users with limited privileges to modify diagnostic logging settings server-wide, potentially obscuring malicious activities. CVE-2026-18698, a Medium severity flaw, enables authenticated users with limited database-scoped roles to perform actions against protected system collections that require more specific privileges, potentially exposing collection metadata or allowing unauthorized modifications.
These thirteen vulnerabilities were disclosed simultaneously on August 11, 2026, indicating a coordinated disclosure event. While the provided information does not specify exact patch versions or detailed mitigation steps beyond the general disclosure, users are strongly advised to consult official MongoDB advisories for the latest information on affected versions and available updates. Given the range of impacts, from denial of service to potential memory corruption and unauthorized access, prompt review and application of security patches are critical for maintaining the integrity and availability of MongoDB deployments.
The simultaneous disclosure of these thirteen vulnerabilities highlights a concentrated security event for MongoDB Server. Administrators should prioritize understanding the specific risks posed by each CVE relevant to their deployment and ensure timely remediation. The breadth of issues, affecting query engines, aggregation frameworks, authentication mechanisms, and administrative functions, underscores the complexity of securing database systems and the importance of staying informed about coordinated vulnerability disclosures.
Key findings:
- Thirteen MongoDB Server vulnerabilities disclosed on August 11, 2026, ranging from Medium to High severity.
- Several High severity flaws (CVE-2026-18711, CVE-2026-18692, CVE-2026-18688, CVE-2026-18697, CVE-2026-18690, CVE-2026-18694, CVE-2026-18687) pose risks of server crashes, memory corruption, and potential code execution.
- Vulnerabilities impact authenticated users, with some allowing privilege escalation or unauthorized data manipulation.
- Denial-of-service conditions can be triggered through crafted queries, aggregation commands, or malformed data.
- Issues affect various components including query execution, aggregation framework, time-series collections, and geospatial processing.
- Coordinated disclosure of all thirteen CVEs on the same date suggests a single, significant security event.
CVEs disclosed: CVE-2026-18711, CVE-2026-18702, CVE-2026-18701, CVE-2026-18698, CVE-2026-18697, CVE-2026-18696, CVE-2026-18695, CVE-2026-18694, CVE-2026-18692, CVE-2026-18691, CVE-2026-18690, CVE-2026-18688, CVE-2026-18687. image_prompt: A stylized representation of a MongoDB database server, with multiple abstract data blocks showing critical errors or corruption. Some blocks are leaking light, while others are depicted as fragmented or dissolving. The overall scene conveys a sense of system instability and data integrity compromise. title: MongoDB Server: Thirteen Vulnerabilities Disclosed in Single Batch lede: Thirteen MongoDB Server vulnerabilities, ranging from Medium to High severity, were disclosed together on August 11, 2026, impacting query processing, data integrity, and server stability. </strong> rom:emit{body_md: