What is CVE-2026-4148?

CVE-2026-4148 is a high-severity vulnerability in Mongodb Inc Server, classified under Use After Free. CVSS score: 8.8/10. Published 2026-03-17.

How severe is CVE-2026-4148?

High severity. CVSS v3 base score is 8.8 out of 10.

Use After Free in Mongodb Inc Server

CVE-2026-4148

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.

Vulnerability class: Use-After-Free

EPSS: 0.001 (21.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mongodb Inc Server — versions 8.2, 8.0, 7.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

jira.mongodb.org/browse/SERVER-119319

Frequently asked questions

What is CVE-2026-4148?: CVE-2026-4148 is a high-severity vulnerability in Mongodb Inc Server, classified under Use After Free. CVSS score: 8.8/10. Published 2026-03-17.
How severe is CVE-2026-4148?: High severity. CVSS v3 base score is 8.8 out of 10.