Use-after-free in MongoDB Server - CVE-2026-18692
Published: August 18, 2026
Vulnerability identifier: #VU144133
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-18692
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute unintended code or cause a denial of service.
The vulnerability exists due to use-after-free in timeseries bucket lifecycle handling when processing write operations. A remote user can trigger use of an internal reference after the underlying memory has been freed to execute unintended code or cause a denial of service.
Affected software
MongoDB Server
How to mitigate CVE-2026-18692
Install security update from vendor's website.
MongoDB Server - update to 8.3.8