NULL pointer dereference in MongoDB Server - CVE-2026-9743
Published: August 18, 2026
Vulnerability identifier: #VU144163
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-9743
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the aggregation sub-pipeline handling logic when processing a specially crafted aggregation pipeline followed by getMore on the same cursor. A remote user can issue a specially crafted aggregation followed by getMore to cause a denial of service.
Exploitation requires the ability to run aggregation pipelines.
Affected software
MongoDB Server
How to mitigate CVE-2026-9743
Install security update from vendor's website.
MongoDB Server - update to 8.0.24