What is CVE-2026-118383?

CVE-2026-118383 is a critical-severity vulnerability in MongoDB Server, classified under Use After Free. CVSS score: 9.0/10. Published 2026-11-10.

How severe is CVE-2026-118383?

Critical severity. CVSS v3 base score is 9.0 out of 10.

Use After Free in MongoDB Server

CVE-2026-118383

A use-after-free in the replication component of MongoDB Server can occur when a newly elected replica set primary completes catch-up. The condition can be caused by requests that do not require authentication, and may result in the server terminating unexpectedly or, under certain conditions, arbitrary code execution in the context of the server process. Replica set members are affected, including the shard and config server replica set members of sharded clusters; standalone mongod instances are not.

Vulnerability class: Use-After-Free

Published 2026-11-10 · last modified 2026-11-10.

CVSS v3 metric

CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

MongoDB Server

Weakness classification (CWE)

CWE-416 — Use After Free

References

Frequently asked questions

What is CVE-2026-118383?: CVE-2026-118383 is a critical-severity vulnerability in MongoDB Server, classified under Use After Free. CVSS score: 9.0/10. Published 2026-11-10.
How severe is CVE-2026-118383?: Critical severity. CVSS v3 base score is 9.0 out of 10.