NULL pointer dereference in MongoDB
CVE-2026-8063
An authenticated user can crash mongod when running $rankFusion or $scoreFusion with an empty pipeline on a view. When resolving a view, the server inspects the aggregation pipeline to determine whether it begins with an Atlas Search stage. For $rankFusion and $scoreFusion, this inspection reads the first element on each stage’s input pipeline array without first verifying that the array is non-empty. Supplying an empty pipeline causes a null pointer dereference and crashes the server. This issue affects MongoDB Server 8.2 versions prior to 8.2.7.
EPSS: 0.002 (13.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Mongodb
- Mongodb Inc. Server — versions 8.2.0
Weakness classification (CWE)
References
- cna@mongodb.com (issue-tracking, Patch, Issue Tracking)
Frequently asked questions
- What is CVE-2026-8063?
- CVE-2026-8063 is a medium-severity vulnerability in MongoDB, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-05-07.
- How severe is CVE-2026-8063?
- Medium severity. CVSS v3 base score is 6.5 out of 10.