Use-after-free in MongoDB Server - CVE-2026-18711
Published: August 18, 2026
Vulnerability identifier: #VU144148
CSH Severity: Low
CVSS v4: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-18711
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service or disclose sensitive information.
The vulnerability exists due to use-after-free in the query execution engine when running certain queries against time-series collections. A remote user can run crafted queries to cause a denial of service or disclose sensitive information.
Exploitation requires read and write privileges on the affected database.
Affected software
MongoDB Server
How to mitigate CVE-2026-18711
Install security update from vendor's website.
MongoDB Server - addressed in versions 8.0.29, 8.3.8