CVE-2026-114655
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Oct 22, 2026
Vendor
unknown
Description
libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values from key vault documents, KMS provider configuration and KMS responses into request lines, headers and signed request bodies without validating or encoding them for each context. A user with write access to the key vault collection can alter the structure of these requests, including adding members to request bodies and token claims that the library then signs with the application's credentials. This may result in key management operations being performed with parameters the application did not intend.