Reachable assertion in MongoDB Server - CVE-2026-18707
Published: August 18, 2026
Vulnerability identifier: #VU144128
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-18707
CWE-ID: CWE-617
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 reachable assertion in aggregation command handling when processing a specially formed aggregation command. A remote user can submit a specially formed aggregation command to cause a denial of service.
The issue can cause the server process to terminate unexpectedly.
Affected software
MongoDB Server
How to mitigate CVE-2026-18707
Install security update from vendor's website.
MongoDB Server - update to 8.3.8