Resource exhaustion in MongoDB Server - CVE-2026-8202
Published: August 18, 2026
Vulnerability identifier: #VU144157
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-2026-8202
CWE-ID: CWE-400
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 uncontrolled resource consumption in the $trim, $ltrim, and $rtrim aggregation operators when processing a densely populated chars mask and a large input string. A remote user can submit a crafted aggregation expression to cause a denial of service.
Exploitation requires aggregation permissions.
Affected software
MongoDB Server
How to mitigate CVE-2026-8202
Install security update from vendor's website.
MongoDB Server - addressed in versions 7.0.34, 8.0.23, 8.2.9, 8.3.2