Integer overflow in MongoDB Libmongocrypt
CVE-2026-106429
An integer underflow in the KMS endpoint-parsing logic of MongoDB libmongocrypt can cause an allocation failure that terminates the application process. This can occur when an authenticated user modifies a key document in the key vault collection, or when an application accepts a KMS endpoint containing a colon after its path or query during key creation. The issue does not access memory outside its allocated bounds.
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: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
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-106429?
- CVE-2026-106429 is a medium-severity vulnerability in MongoDB Libmongocrypt, classified under Integer Underflow. CVSS score: 6.5/10. Published 2026-10-08.
- How severe is CVE-2026-106429?
- Medium severity. CVSS v3 base score is 6.5 out of 10.