What is CVE-2026-120955?

CVE-2026-120955 is a high-severity vulnerability in MongoDB C Driver, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-11-03.

How severe is CVE-2026-120955?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in MongoDB C Driver

CVE-2026-120955

The GridFS file download API in the MongoDB C Driver does not check the result of an internal operation under certain error conditions during file retrieval. This can cause the process to terminate when stream operations continue. A user who can influence file download parameters can trigger this condition, which may result in service unavailability for applications using the affected API.

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 C Driver

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

jira.mongodb.org/browse/CDRIVER-6494

Frequently asked questions

What is CVE-2026-120955?: CVE-2026-120955 is a high-severity vulnerability in MongoDB C Driver, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-11-03.
How severe is CVE-2026-120955?: High severity. CVSS v3 base score is 7.5 out of 10.