What is CVE-2026-4358?

CVE-2026-4358 is a medium-severity vulnerability in Mongodb, classified under Double Free. CVSS score: 6.4/10. Published 2026-03-17.

How severe is CVE-2026-4358?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Double Free in Mongodb

CVE-2026-4358

A specially crafted aggregation query with $lookup by an authenticated user with write privileges can cause a double-free or use-after-free memory issue in the slot-based execution (SBE) engine when an in-memory hash table is spilled to disk.

Vulnerability class: Double Free

EPSS: 0.003 (26.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H.

Affected products

Mongodb
Mongodb Inc Server — versions 8.2, 8.0, 7.0

Weakness classification (CWE)

CWE-415 — Double Free

References

cna@mongodb.com (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-4358?: CVE-2026-4358 is a medium-severity vulnerability in Mongodb, classified under Double Free. CVSS score: 6.4/10. Published 2026-03-17.
How severe is CVE-2026-4358?: Medium severity. CVSS v3 base score is 6.4 out of 10.