CVE-2026-106429
Application denial of service via malformed KMS endpoint in MongoDB libmongocrypt
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-191 |
| Vendor | mongodb |
| Product | libmongocrypt |
| Ecosystems | |
| Industries | Technology |
| Published | Oct 8, 2026 |
| Last Updated | Oct 8, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
MongoDB / libmongocrypt
1.1.0 < 1.20.5