Out-of-bounds read in MongoDB Server - CVE-2026-18688
Published: August 18, 2026
Vulnerability identifier: #VU144132
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-18688
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service and disclose limited memory contents.
The vulnerability exists due to out-of-bounds read in the aggregation framework when processing a specially formed numeric parameter in a certain aggregation pipeline stage. A remote user can provide a specially formed numeric parameter to cause a denial of service and disclose limited memory contents.
Affected software
MongoDB Server
How to mitigate CVE-2026-18688
Install security update from vendor's website.
MongoDB Server - addressed in versions 7.0.40, 8.0.29, 8.3.8