Vulnerability in MongoDB C Driver
CVE-2026-120684
A memory-initialization flaw in the legacy GridFS file handling of the MongoDB C Driver can cause uninitialized process memory to be treated as valid file content and stored on the server. A database user holding ordinary write access to a shared storage area can arrange conditions under which an application later appends to such a file and writes that memory into records the same user is permitted to read, which may result in unintended disclosure of sensitive information from the application's process, including credentials.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
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
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-120684?
- CVE-2026-120684 is a medium-severity vulnerability in MongoDB C Driver, classified under Use of Uninitialized Resource. CVSS score: 6.5/10. Published 2026-11-03.
- How severe is CVE-2026-120684?
- Medium severity. CVSS v3 base score is 6.5 out of 10.