CVE-2026-4148 HIGH

CVE-2026-4148: ExpressionContext use-after-free in classic engine $lookup and $graphLookup aggregation operators

Vendor Mongodb Inc
Product MongoDB Server
Weakness CWE-416
Published March 17, 2026
Last update March 18, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

A use-after-free vulnerability can be triggered in sharded clusters by an authenticated user with the read role who issues a specially crafted $lookup or $graphLookup aggregation pipeline.

Key dates

02Disclosure timeline

March 17, 2026 CVE published
March 18, 2026 Record updated