CVE-2026-9743: CWE-476 NULL pointer dereference in MongoDB MongoDB server
CVE-2026-9743 is a high-severity vulnerability in MongoDB Server 8.0. It involves a NULL pointer dereference in the aggregation pipeline processing. An authenticated user with permission to run aggregation pipelines can cause the server to crash by issuing a specially crafted aggregation followed by a getMore command on the same cursor, leading to denial of service.
AI Analysis
Technical Summary
In MongoDB Server version 8.0.0, a flaw exists in the aggregation stage processing where the _subPipeline field can remain null during certain pipeline executions. If a getMore command is issued on the same cursor afterward, the server attempts to dereference this null _subPipeline pointer when reattaching to the operation context. This results in accessing an invalid memory address and crashing the MongoDB server process. The vulnerability requires authenticated access with the ability to run aggregation pipelines and leads to denial of service by crashing the server.
Potential Impact
An authenticated user with privileges to execute aggregation pipelines can cause the MongoDB server to crash, resulting in denial of service. There is no indication of data corruption or unauthorized data access, but service availability is impacted.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict aggregation pipeline execution privileges to trusted users only to reduce risk.
CVE-2026-9743: CWE-476 NULL pointer dereference in MongoDB MongoDB server
Description
CVE-2026-9743 is a high-severity vulnerability in MongoDB Server 8.0. It involves a NULL pointer dereference in the aggregation pipeline processing. An authenticated user with permission to run aggregation pipelines can cause the server to crash by issuing a specially crafted aggregation followed by a getMore command on the same cursor, leading to denial of service.
CVSS v4.0
Score 7.1high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In MongoDB Server version 8.0.0, a flaw exists in the aggregation stage processing where the _subPipeline field can remain null during certain pipeline executions. If a getMore command is issued on the same cursor afterward, the server attempts to dereference this null _subPipeline pointer when reattaching to the operation context. This results in accessing an invalid memory address and crashing the MongoDB server process. The vulnerability requires authenticated access with the ability to run aggregation pipelines and leads to denial of service by crashing the server.
Potential Impact
An authenticated user with privileges to execute aggregation pipelines can cause the MongoDB server to crash, resulting in denial of service. There is no indication of data corruption or unauthorized data access, but service availability is impacted.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict aggregation pipeline execution privileges to trusted users only to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-05-27T17:34:45.641Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a2892f48dd33fbd858e3b3b
Added to database: 06/09/2026, 22:25:56 UTC
Last enriched: 06/17/2026, 09:14:33 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 180
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